diff --git a/Modules/clinic/_bz2module.c.h b/Modules/clinic/_bz2module.c.h
index c4032ea..1ca810c 100644
--- a/Modules/clinic/_bz2module.c.h
+++ b/Modules/clinic/_bz2module.c.h
@@ -115,14 +115,14 @@
 "the unused_data attribute.");
 
 #define _BZ2_BZ2DECOMPRESSOR_DECOMPRESS_METHODDEF    \
-    {"decompress", (PyCFunction)_bz2_BZ2Decompressor_decompress, METH_VARARGS|METH_KEYWORDS, _bz2_BZ2Decompressor_decompress__doc__},
+    {"decompress", (PyCFunction)_bz2_BZ2Decompressor_decompress, METH_FASTCALL, _bz2_BZ2Decompressor_decompress__doc__},
 
 static PyObject *
 _bz2_BZ2Decompressor_decompress_impl(BZ2Decompressor *self, Py_buffer *data,
                                      Py_ssize_t max_length);
 
 static PyObject *
-_bz2_BZ2Decompressor_decompress(BZ2Decompressor *self, PyObject *args, PyObject *kwargs)
+_bz2_BZ2Decompressor_decompress(BZ2Decompressor *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"data", "max_length", NULL};
@@ -130,7 +130,7 @@
     Py_buffer data = {NULL, NULL};
     Py_ssize_t max_length = -1;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &data, &max_length)) {
         goto exit;
     }
@@ -174,4 +174,4 @@
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=40e5ef049f9e719b input=a9049054013a1b77]*/
+/*[clinic end generated code: output=7e57af0b368d3e55 input=a9049054013a1b77]*/
diff --git a/Modules/clinic/_codecsmodule.c.h b/Modules/clinic/_codecsmodule.c.h
index c7fd66f..056287d 100644
--- a/Modules/clinic/_codecsmodule.c.h
+++ b/Modules/clinic/_codecsmodule.c.h
@@ -55,14 +55,14 @@
 "codecs.register_error that can handle ValueErrors.");
 
 #define _CODECS_ENCODE_METHODDEF    \
-    {"encode", (PyCFunction)_codecs_encode, METH_VARARGS|METH_KEYWORDS, _codecs_encode__doc__},
+    {"encode", (PyCFunction)_codecs_encode, METH_FASTCALL, _codecs_encode__doc__},
 
 static PyObject *
 _codecs_encode_impl(PyObject *module, PyObject *obj, const char *encoding,
                     const char *errors);
 
 static PyObject *
-_codecs_encode(PyObject *module, PyObject *args, PyObject *kwargs)
+_codecs_encode(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"obj", "encoding", "errors", NULL};
@@ -71,7 +71,7 @@
     const char *encoding = NULL;
     const char *errors = NULL;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &obj, &encoding, &errors)) {
         goto exit;
     }
@@ -94,14 +94,14 @@
 "codecs.register_error that can handle ValueErrors.");
 
 #define _CODECS_DECODE_METHODDEF    \
-    {"decode", (PyCFunction)_codecs_decode, METH_VARARGS|METH_KEYWORDS, _codecs_decode__doc__},
+    {"decode", (PyCFunction)_codecs_decode, METH_FASTCALL, _codecs_decode__doc__},
 
 static PyObject *
 _codecs_decode_impl(PyObject *module, PyObject *obj, const char *encoding,
                     const char *errors);
 
 static PyObject *
-_codecs_decode(PyObject *module, PyObject *args, PyObject *kwargs)
+_codecs_decode(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"obj", "encoding", "errors", NULL};
@@ -110,7 +110,7 @@
     const char *encoding = NULL;
     const char *errors = NULL;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &obj, &encoding, &errors)) {
         goto exit;
     }
@@ -1536,4 +1536,4 @@
 #ifndef _CODECS_CODE_PAGE_ENCODE_METHODDEF
     #define _CODECS_CODE_PAGE_ENCODE_METHODDEF
 #endif /* !defined(_CODECS_CODE_PAGE_ENCODE_METHODDEF) */
-/*[clinic end generated code: output=ebe313ab417b17bb input=a9049054013a1b77]*/
+/*[clinic end generated code: output=6d6afcabde10ed79 input=a9049054013a1b77]*/
diff --git a/Modules/clinic/_datetimemodule.c.h b/Modules/clinic/_datetimemodule.c.h
index cf09207..dcb992b 100644
--- a/Modules/clinic/_datetimemodule.c.h
+++ b/Modules/clinic/_datetimemodule.c.h
@@ -14,20 +14,20 @@
 "If no tz is specified, uses local timezone.");
 
 #define DATETIME_DATETIME_NOW_METHODDEF    \
-    {"now", (PyCFunction)datetime_datetime_now, METH_VARARGS|METH_KEYWORDS|METH_CLASS, datetime_datetime_now__doc__},
+    {"now", (PyCFunction)datetime_datetime_now, METH_FASTCALL|METH_CLASS, datetime_datetime_now__doc__},
 
 static PyObject *
 datetime_datetime_now_impl(PyTypeObject *type, PyObject *tz);
 
 static PyObject *
-datetime_datetime_now(PyTypeObject *type, PyObject *args, PyObject *kwargs)
+datetime_datetime_now(PyTypeObject *type, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"tz", NULL};
     static _PyArg_Parser _parser = {"|O:now", _keywords, 0};
     PyObject *tz = Py_None;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &tz)) {
         goto exit;
     }
@@ -36,4 +36,4 @@
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=61f85af5637df8b5 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=8aaac0705add61ca input=a9049054013a1b77]*/
diff --git a/Modules/clinic/_elementtree.c.h b/Modules/clinic/_elementtree.c.h
index c91dfbf..1b309cd 100644
--- a/Modules/clinic/_elementtree.c.h
+++ b/Modules/clinic/_elementtree.c.h
@@ -136,14 +136,14 @@
 "\n");
 
 #define _ELEMENTTREE_ELEMENT_FIND_METHODDEF    \
-    {"find", (PyCFunction)_elementtree_Element_find, METH_VARARGS|METH_KEYWORDS, _elementtree_Element_find__doc__},
+    {"find", (PyCFunction)_elementtree_Element_find, METH_FASTCALL, _elementtree_Element_find__doc__},
 
 static PyObject *
 _elementtree_Element_find_impl(ElementObject *self, PyObject *path,
                                PyObject *namespaces);
 
 static PyObject *
-_elementtree_Element_find(ElementObject *self, PyObject *args, PyObject *kwargs)
+_elementtree_Element_find(ElementObject *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"path", "namespaces", NULL};
@@ -151,7 +151,7 @@
     PyObject *path;
     PyObject *namespaces = Py_None;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &path, &namespaces)) {
         goto exit;
     }
@@ -167,7 +167,7 @@
 "\n");
 
 #define _ELEMENTTREE_ELEMENT_FINDTEXT_METHODDEF    \
-    {"findtext", (PyCFunction)_elementtree_Element_findtext, METH_VARARGS|METH_KEYWORDS, _elementtree_Element_findtext__doc__},
+    {"findtext", (PyCFunction)_elementtree_Element_findtext, METH_FASTCALL, _elementtree_Element_findtext__doc__},
 
 static PyObject *
 _elementtree_Element_findtext_impl(ElementObject *self, PyObject *path,
@@ -175,7 +175,7 @@
                                    PyObject *namespaces);
 
 static PyObject *
-_elementtree_Element_findtext(ElementObject *self, PyObject *args, PyObject *kwargs)
+_elementtree_Element_findtext(ElementObject *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"path", "default", "namespaces", NULL};
@@ -184,7 +184,7 @@
     PyObject *default_value = Py_None;
     PyObject *namespaces = Py_None;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &path, &default_value, &namespaces)) {
         goto exit;
     }
@@ -200,14 +200,14 @@
 "\n");
 
 #define _ELEMENTTREE_ELEMENT_FINDALL_METHODDEF    \
-    {"findall", (PyCFunction)_elementtree_Element_findall, METH_VARARGS|METH_KEYWORDS, _elementtree_Element_findall__doc__},
+    {"findall", (PyCFunction)_elementtree_Element_findall, METH_FASTCALL, _elementtree_Element_findall__doc__},
 
 static PyObject *
 _elementtree_Element_findall_impl(ElementObject *self, PyObject *path,
                                   PyObject *namespaces);
 
 static PyObject *
-_elementtree_Element_findall(ElementObject *self, PyObject *args, PyObject *kwargs)
+_elementtree_Element_findall(ElementObject *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"path", "namespaces", NULL};
@@ -215,7 +215,7 @@
     PyObject *path;
     PyObject *namespaces = Py_None;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &path, &namespaces)) {
         goto exit;
     }
@@ -231,14 +231,14 @@
 "\n");
 
 #define _ELEMENTTREE_ELEMENT_ITERFIND_METHODDEF    \
-    {"iterfind", (PyCFunction)_elementtree_Element_iterfind, METH_VARARGS|METH_KEYWORDS, _elementtree_Element_iterfind__doc__},
+    {"iterfind", (PyCFunction)_elementtree_Element_iterfind, METH_FASTCALL, _elementtree_Element_iterfind__doc__},
 
 static PyObject *
 _elementtree_Element_iterfind_impl(ElementObject *self, PyObject *path,
                                    PyObject *namespaces);
 
 static PyObject *
-_elementtree_Element_iterfind(ElementObject *self, PyObject *args, PyObject *kwargs)
+_elementtree_Element_iterfind(ElementObject *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"path", "namespaces", NULL};
@@ -246,7 +246,7 @@
     PyObject *path;
     PyObject *namespaces = Py_None;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &path, &namespaces)) {
         goto exit;
     }
@@ -262,14 +262,14 @@
 "\n");
 
 #define _ELEMENTTREE_ELEMENT_GET_METHODDEF    \
-    {"get", (PyCFunction)_elementtree_Element_get, METH_VARARGS|METH_KEYWORDS, _elementtree_Element_get__doc__},
+    {"get", (PyCFunction)_elementtree_Element_get, METH_FASTCALL, _elementtree_Element_get__doc__},
 
 static PyObject *
 _elementtree_Element_get_impl(ElementObject *self, PyObject *key,
                               PyObject *default_value);
 
 static PyObject *
-_elementtree_Element_get(ElementObject *self, PyObject *args, PyObject *kwargs)
+_elementtree_Element_get(ElementObject *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"key", "default", NULL};
@@ -277,7 +277,7 @@
     PyObject *key;
     PyObject *default_value = Py_None;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &key, &default_value)) {
         goto exit;
     }
@@ -310,20 +310,20 @@
 "\n");
 
 #define _ELEMENTTREE_ELEMENT_ITER_METHODDEF    \
-    {"iter", (PyCFunction)_elementtree_Element_iter, METH_VARARGS|METH_KEYWORDS, _elementtree_Element_iter__doc__},
+    {"iter", (PyCFunction)_elementtree_Element_iter, METH_FASTCALL, _elementtree_Element_iter__doc__},
 
 static PyObject *
 _elementtree_Element_iter_impl(ElementObject *self, PyObject *tag);
 
 static PyObject *
-_elementtree_Element_iter(ElementObject *self, PyObject *args, PyObject *kwargs)
+_elementtree_Element_iter(ElementObject *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"tag", NULL};
     static _PyArg_Parser _parser = {"|O:iter", _keywords, 0};
     PyObject *tag = Py_None;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &tag)) {
         goto exit;
     }
@@ -702,4 +702,4 @@
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=4c5e94c28a009ce6 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=b4a571a98ced3163 input=a9049054013a1b77]*/
diff --git a/Modules/clinic/_hashopenssl.c.h b/Modules/clinic/_hashopenssl.c.h
index 96e6cfe..0445352 100644
--- a/Modules/clinic/_hashopenssl.c.h
+++ b/Modules/clinic/_hashopenssl.c.h
@@ -12,7 +12,7 @@
 "scrypt password-based key derivation function.");
 
 #define _HASHLIB_SCRYPT_METHODDEF    \
-    {"scrypt", (PyCFunction)_hashlib_scrypt, METH_VARARGS|METH_KEYWORDS, _hashlib_scrypt__doc__},
+    {"scrypt", (PyCFunction)_hashlib_scrypt, METH_FASTCALL, _hashlib_scrypt__doc__},
 
 static PyObject *
 _hashlib_scrypt_impl(PyObject *module, Py_buffer *password, Py_buffer *salt,
@@ -20,7 +20,7 @@
                      long maxmem, long dklen);
 
 static PyObject *
-_hashlib_scrypt(PyObject *module, PyObject *args, PyObject *kwargs)
+_hashlib_scrypt(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"password", "salt", "n", "r", "p", "maxmem", "dklen", NULL};
@@ -33,7 +33,7 @@
     long maxmem = 0;
     long dklen = 64;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &password, &salt, &PyLong_Type, &n_obj, &PyLong_Type, &r_obj, &PyLong_Type, &p_obj, &maxmem, &dklen)) {
         goto exit;
     }
@@ -57,4 +57,4 @@
 #ifndef _HASHLIB_SCRYPT_METHODDEF
     #define _HASHLIB_SCRYPT_METHODDEF
 #endif /* !defined(_HASHLIB_SCRYPT_METHODDEF) */
-/*[clinic end generated code: output=8c5386789f77430a input=a9049054013a1b77]*/
+/*[clinic end generated code: output=118cd7036fa0fb52 input=a9049054013a1b77]*/
diff --git a/Modules/clinic/_lzmamodule.c.h b/Modules/clinic/_lzmamodule.c.h
index c2ac89a..9e60759 100644
--- a/Modules/clinic/_lzmamodule.c.h
+++ b/Modules/clinic/_lzmamodule.c.h
@@ -81,14 +81,14 @@
 "the unused_data attribute.");
 
 #define _LZMA_LZMADECOMPRESSOR_DECOMPRESS_METHODDEF    \
-    {"decompress", (PyCFunction)_lzma_LZMADecompressor_decompress, METH_VARARGS|METH_KEYWORDS, _lzma_LZMADecompressor_decompress__doc__},
+    {"decompress", (PyCFunction)_lzma_LZMADecompressor_decompress, METH_FASTCALL, _lzma_LZMADecompressor_decompress__doc__},
 
 static PyObject *
 _lzma_LZMADecompressor_decompress_impl(Decompressor *self, Py_buffer *data,
                                        Py_ssize_t max_length);
 
 static PyObject *
-_lzma_LZMADecompressor_decompress(Decompressor *self, PyObject *args, PyObject *kwargs)
+_lzma_LZMADecompressor_decompress(Decompressor *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"data", "max_length", NULL};
@@ -96,7 +96,7 @@
     Py_buffer data = {NULL, NULL};
     Py_ssize_t max_length = -1;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &data, &max_length)) {
         goto exit;
     }
@@ -256,4 +256,4 @@
 
     return return_value;
 }
-/*[clinic end generated code: output=9434583fe111c771 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=f27abae460122706 input=a9049054013a1b77]*/
diff --git a/Modules/clinic/_pickle.c.h b/Modules/clinic/_pickle.c.h
index b8eec33..9ad4c37 100644
--- a/Modules/clinic/_pickle.c.h
+++ b/Modules/clinic/_pickle.c.h
@@ -384,14 +384,14 @@
 "2, so that the pickle data stream is readable with Python 2.");
 
 #define _PICKLE_DUMP_METHODDEF    \
-    {"dump", (PyCFunction)_pickle_dump, METH_VARARGS|METH_KEYWORDS, _pickle_dump__doc__},
+    {"dump", (PyCFunction)_pickle_dump, METH_FASTCALL, _pickle_dump__doc__},
 
 static PyObject *
 _pickle_dump_impl(PyObject *module, PyObject *obj, PyObject *file,
                   PyObject *protocol, int fix_imports);
 
 static PyObject *
-_pickle_dump(PyObject *module, PyObject *args, PyObject *kwargs)
+_pickle_dump(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"obj", "file", "protocol", "fix_imports", NULL};
@@ -401,7 +401,7 @@
     PyObject *protocol = NULL;
     int fix_imports = 1;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &obj, &file, &protocol, &fix_imports)) {
         goto exit;
     }
@@ -430,14 +430,14 @@
 "Python 2, so that the pickle data stream is readable with Python 2.");
 
 #define _PICKLE_DUMPS_METHODDEF    \
-    {"dumps", (PyCFunction)_pickle_dumps, METH_VARARGS|METH_KEYWORDS, _pickle_dumps__doc__},
+    {"dumps", (PyCFunction)_pickle_dumps, METH_FASTCALL, _pickle_dumps__doc__},
 
 static PyObject *
 _pickle_dumps_impl(PyObject *module, PyObject *obj, PyObject *protocol,
                    int fix_imports);
 
 static PyObject *
-_pickle_dumps(PyObject *module, PyObject *args, PyObject *kwargs)
+_pickle_dumps(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"obj", "protocol", "fix_imports", NULL};
@@ -446,7 +446,7 @@
     PyObject *protocol = NULL;
     int fix_imports = 1;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &obj, &protocol, &fix_imports)) {
         goto exit;
     }
@@ -486,14 +486,14 @@
 "string instances as bytes objects.");
 
 #define _PICKLE_LOAD_METHODDEF    \
-    {"load", (PyCFunction)_pickle_load, METH_VARARGS|METH_KEYWORDS, _pickle_load__doc__},
+    {"load", (PyCFunction)_pickle_load, METH_FASTCALL, _pickle_load__doc__},
 
 static PyObject *
 _pickle_load_impl(PyObject *module, PyObject *file, int fix_imports,
                   const char *encoding, const char *errors);
 
 static PyObject *
-_pickle_load(PyObject *module, PyObject *args, PyObject *kwargs)
+_pickle_load(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"file", "fix_imports", "encoding", "errors", NULL};
@@ -503,7 +503,7 @@
     const char *encoding = "ASCII";
     const char *errors = "strict";
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &file, &fix_imports, &encoding, &errors)) {
         goto exit;
     }
@@ -534,14 +534,14 @@
 "string instances as bytes objects.");
 
 #define _PICKLE_LOADS_METHODDEF    \
-    {"loads", (PyCFunction)_pickle_loads, METH_VARARGS|METH_KEYWORDS, _pickle_loads__doc__},
+    {"loads", (PyCFunction)_pickle_loads, METH_FASTCALL, _pickle_loads__doc__},
 
 static PyObject *
 _pickle_loads_impl(PyObject *module, PyObject *data, int fix_imports,
                    const char *encoding, const char *errors);
 
 static PyObject *
-_pickle_loads(PyObject *module, PyObject *args, PyObject *kwargs)
+_pickle_loads(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"data", "fix_imports", "encoding", "errors", NULL};
@@ -551,7 +551,7 @@
     const char *encoding = "ASCII";
     const char *errors = "strict";
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &data, &fix_imports, &encoding, &errors)) {
         goto exit;
     }
@@ -560,4 +560,4 @@
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=50f9127109673c98 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=82be137b3c09cb9f input=a9049054013a1b77]*/
diff --git a/Modules/clinic/_sre.c.h b/Modules/clinic/_sre.c.h
index 9aba13e..0612005 100644
--- a/Modules/clinic/_sre.c.h
+++ b/Modules/clinic/_sre.c.h
@@ -69,7 +69,7 @@
 "Matches zero or more characters at the beginning of the string.");
 
 #define _SRE_SRE_PATTERN_MATCH_METHODDEF    \
-    {"match", (PyCFunction)_sre_SRE_Pattern_match, METH_VARARGS|METH_KEYWORDS, _sre_SRE_Pattern_match__doc__},
+    {"match", (PyCFunction)_sre_SRE_Pattern_match, METH_FASTCALL, _sre_SRE_Pattern_match__doc__},
 
 static PyObject *
 _sre_SRE_Pattern_match_impl(PatternObject *self, PyObject *string,
@@ -77,7 +77,7 @@
                             PyObject *pattern);
 
 static PyObject *
-_sre_SRE_Pattern_match(PatternObject *self, PyObject *args, PyObject *kwargs)
+_sre_SRE_Pattern_match(PatternObject *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"string", "pos", "endpos", "pattern", NULL};
@@ -87,7 +87,7 @@
     Py_ssize_t endpos = PY_SSIZE_T_MAX;
     PyObject *pattern = NULL;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &string, &pos, &endpos, &pattern)) {
         goto exit;
     }
@@ -105,7 +105,7 @@
 "Matches against all of the string");
 
 #define _SRE_SRE_PATTERN_FULLMATCH_METHODDEF    \
-    {"fullmatch", (PyCFunction)_sre_SRE_Pattern_fullmatch, METH_VARARGS|METH_KEYWORDS, _sre_SRE_Pattern_fullmatch__doc__},
+    {"fullmatch", (PyCFunction)_sre_SRE_Pattern_fullmatch, METH_FASTCALL, _sre_SRE_Pattern_fullmatch__doc__},
 
 static PyObject *
 _sre_SRE_Pattern_fullmatch_impl(PatternObject *self, PyObject *string,
@@ -113,7 +113,7 @@
                                 PyObject *pattern);
 
 static PyObject *
-_sre_SRE_Pattern_fullmatch(PatternObject *self, PyObject *args, PyObject *kwargs)
+_sre_SRE_Pattern_fullmatch(PatternObject *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"string", "pos", "endpos", "pattern", NULL};
@@ -123,7 +123,7 @@
     Py_ssize_t endpos = PY_SSIZE_T_MAX;
     PyObject *pattern = NULL;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &string, &pos, &endpos, &pattern)) {
         goto exit;
     }
@@ -143,7 +143,7 @@
 "Return None if no position in the string matches.");
 
 #define _SRE_SRE_PATTERN_SEARCH_METHODDEF    \
-    {"search", (PyCFunction)_sre_SRE_Pattern_search, METH_VARARGS|METH_KEYWORDS, _sre_SRE_Pattern_search__doc__},
+    {"search", (PyCFunction)_sre_SRE_Pattern_search, METH_FASTCALL, _sre_SRE_Pattern_search__doc__},
 
 static PyObject *
 _sre_SRE_Pattern_search_impl(PatternObject *self, PyObject *string,
@@ -151,7 +151,7 @@
                              PyObject *pattern);
 
 static PyObject *
-_sre_SRE_Pattern_search(PatternObject *self, PyObject *args, PyObject *kwargs)
+_sre_SRE_Pattern_search(PatternObject *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"string", "pos", "endpos", "pattern", NULL};
@@ -161,7 +161,7 @@
     Py_ssize_t endpos = PY_SSIZE_T_MAX;
     PyObject *pattern = NULL;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &string, &pos, &endpos, &pattern)) {
         goto exit;
     }
@@ -179,7 +179,7 @@
 "Return a list of all non-overlapping matches of pattern in string.");
 
 #define _SRE_SRE_PATTERN_FINDALL_METHODDEF    \
-    {"findall", (PyCFunction)_sre_SRE_Pattern_findall, METH_VARARGS|METH_KEYWORDS, _sre_SRE_Pattern_findall__doc__},
+    {"findall", (PyCFunction)_sre_SRE_Pattern_findall, METH_FASTCALL, _sre_SRE_Pattern_findall__doc__},
 
 static PyObject *
 _sre_SRE_Pattern_findall_impl(PatternObject *self, PyObject *string,
@@ -187,7 +187,7 @@
                               PyObject *source);
 
 static PyObject *
-_sre_SRE_Pattern_findall(PatternObject *self, PyObject *args, PyObject *kwargs)
+_sre_SRE_Pattern_findall(PatternObject *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"string", "pos", "endpos", "source", NULL};
@@ -197,7 +197,7 @@
     Py_ssize_t endpos = PY_SSIZE_T_MAX;
     PyObject *source = NULL;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &string, &pos, &endpos, &source)) {
         goto exit;
     }
@@ -216,14 +216,14 @@
 "For each match, the iterator returns a match object.");
 
 #define _SRE_SRE_PATTERN_FINDITER_METHODDEF    \
-    {"finditer", (PyCFunction)_sre_SRE_Pattern_finditer, METH_VARARGS|METH_KEYWORDS, _sre_SRE_Pattern_finditer__doc__},
+    {"finditer", (PyCFunction)_sre_SRE_Pattern_finditer, METH_FASTCALL, _sre_SRE_Pattern_finditer__doc__},
 
 static PyObject *
 _sre_SRE_Pattern_finditer_impl(PatternObject *self, PyObject *string,
                                Py_ssize_t pos, Py_ssize_t endpos);
 
 static PyObject *
-_sre_SRE_Pattern_finditer(PatternObject *self, PyObject *args, PyObject *kwargs)
+_sre_SRE_Pattern_finditer(PatternObject *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"string", "pos", "endpos", NULL};
@@ -232,7 +232,7 @@
     Py_ssize_t pos = 0;
     Py_ssize_t endpos = PY_SSIZE_T_MAX;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &string, &pos, &endpos)) {
         goto exit;
     }
@@ -248,14 +248,14 @@
 "\n");
 
 #define _SRE_SRE_PATTERN_SCANNER_METHODDEF    \
-    {"scanner", (PyCFunction)_sre_SRE_Pattern_scanner, METH_VARARGS|METH_KEYWORDS, _sre_SRE_Pattern_scanner__doc__},
+    {"scanner", (PyCFunction)_sre_SRE_Pattern_scanner, METH_FASTCALL, _sre_SRE_Pattern_scanner__doc__},
 
 static PyObject *
 _sre_SRE_Pattern_scanner_impl(PatternObject *self, PyObject *string,
                               Py_ssize_t pos, Py_ssize_t endpos);
 
 static PyObject *
-_sre_SRE_Pattern_scanner(PatternObject *self, PyObject *args, PyObject *kwargs)
+_sre_SRE_Pattern_scanner(PatternObject *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"string", "pos", "endpos", NULL};
@@ -264,7 +264,7 @@
     Py_ssize_t pos = 0;
     Py_ssize_t endpos = PY_SSIZE_T_MAX;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &string, &pos, &endpos)) {
         goto exit;
     }
@@ -281,14 +281,14 @@
 "Split string by the occurrences of pattern.");
 
 #define _SRE_SRE_PATTERN_SPLIT_METHODDEF    \
-    {"split", (PyCFunction)_sre_SRE_Pattern_split, METH_VARARGS|METH_KEYWORDS, _sre_SRE_Pattern_split__doc__},
+    {"split", (PyCFunction)_sre_SRE_Pattern_split, METH_FASTCALL, _sre_SRE_Pattern_split__doc__},
 
 static PyObject *
 _sre_SRE_Pattern_split_impl(PatternObject *self, PyObject *string,
                             Py_ssize_t maxsplit, PyObject *source);
 
 static PyObject *
-_sre_SRE_Pattern_split(PatternObject *self, PyObject *args, PyObject *kwargs)
+_sre_SRE_Pattern_split(PatternObject *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"string", "maxsplit", "source", NULL};
@@ -297,7 +297,7 @@
     Py_ssize_t maxsplit = 0;
     PyObject *source = NULL;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &string, &maxsplit, &source)) {
         goto exit;
     }
@@ -314,14 +314,14 @@
 "Return the string obtained by replacing the leftmost non-overlapping occurrences of pattern in string by the replacement repl.");
 
 #define _SRE_SRE_PATTERN_SUB_METHODDEF    \
-    {"sub", (PyCFunction)_sre_SRE_Pattern_sub, METH_VARARGS|METH_KEYWORDS, _sre_SRE_Pattern_sub__doc__},
+    {"sub", (PyCFunction)_sre_SRE_Pattern_sub, METH_FASTCALL, _sre_SRE_Pattern_sub__doc__},
 
 static PyObject *
 _sre_SRE_Pattern_sub_impl(PatternObject *self, PyObject *repl,
                           PyObject *string, Py_ssize_t count);
 
 static PyObject *
-_sre_SRE_Pattern_sub(PatternObject *self, PyObject *args, PyObject *kwargs)
+_sre_SRE_Pattern_sub(PatternObject *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"repl", "string", "count", NULL};
@@ -330,7 +330,7 @@
     PyObject *string;
     Py_ssize_t count = 0;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &repl, &string, &count)) {
         goto exit;
     }
@@ -347,14 +347,14 @@
 "Return the tuple (new_string, number_of_subs_made) found by replacing the leftmost non-overlapping occurrences of pattern with the replacement repl.");
 
 #define _SRE_SRE_PATTERN_SUBN_METHODDEF    \
-    {"subn", (PyCFunction)_sre_SRE_Pattern_subn, METH_VARARGS|METH_KEYWORDS, _sre_SRE_Pattern_subn__doc__},
+    {"subn", (PyCFunction)_sre_SRE_Pattern_subn, METH_FASTCALL, _sre_SRE_Pattern_subn__doc__},
 
 static PyObject *
 _sre_SRE_Pattern_subn_impl(PatternObject *self, PyObject *repl,
                            PyObject *string, Py_ssize_t count);
 
 static PyObject *
-_sre_SRE_Pattern_subn(PatternObject *self, PyObject *args, PyObject *kwargs)
+_sre_SRE_Pattern_subn(PatternObject *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"repl", "string", "count", NULL};
@@ -363,7 +363,7 @@
     PyObject *string;
     Py_ssize_t count = 0;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &repl, &string, &count)) {
         goto exit;
     }
@@ -396,20 +396,20 @@
 "\n");
 
 #define _SRE_SRE_PATTERN___DEEPCOPY___METHODDEF    \
-    {"__deepcopy__", (PyCFunction)_sre_SRE_Pattern___deepcopy__, METH_VARARGS|METH_KEYWORDS, _sre_SRE_Pattern___deepcopy____doc__},
+    {"__deepcopy__", (PyCFunction)_sre_SRE_Pattern___deepcopy__, METH_FASTCALL, _sre_SRE_Pattern___deepcopy____doc__},
 
 static PyObject *
 _sre_SRE_Pattern___deepcopy___impl(PatternObject *self, PyObject *memo);
 
 static PyObject *
-_sre_SRE_Pattern___deepcopy__(PatternObject *self, PyObject *args, PyObject *kwargs)
+_sre_SRE_Pattern___deepcopy__(PatternObject *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"memo", NULL};
     static _PyArg_Parser _parser = {"O:__deepcopy__", _keywords, 0};
     PyObject *memo;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &memo)) {
         goto exit;
     }
@@ -426,7 +426,7 @@
 "\n");
 
 #define _SRE_COMPILE_METHODDEF    \
-    {"compile", (PyCFunction)_sre_compile, METH_VARARGS|METH_KEYWORDS, _sre_compile__doc__},
+    {"compile", (PyCFunction)_sre_compile, METH_FASTCALL, _sre_compile__doc__},
 
 static PyObject *
 _sre_compile_impl(PyObject *module, PyObject *pattern, int flags,
@@ -434,7 +434,7 @@
                   PyObject *indexgroup);
 
 static PyObject *
-_sre_compile(PyObject *module, PyObject *args, PyObject *kwargs)
+_sre_compile(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"pattern", "flags", "code", "groups", "groupindex", "indexgroup", NULL};
@@ -446,7 +446,7 @@
     PyObject *groupindex;
     PyObject *indexgroup;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &pattern, &flags, &PyList_Type, &code, &groups, &groupindex, &indexgroup)) {
         goto exit;
     }
@@ -463,20 +463,20 @@
 "Return the string obtained by doing backslash substitution on the string template, as done by the sub() method.");
 
 #define _SRE_SRE_MATCH_EXPAND_METHODDEF    \
-    {"expand", (PyCFunction)_sre_SRE_Match_expand, METH_VARARGS|METH_KEYWORDS, _sre_SRE_Match_expand__doc__},
+    {"expand", (PyCFunction)_sre_SRE_Match_expand, METH_FASTCALL, _sre_SRE_Match_expand__doc__},
 
 static PyObject *
 _sre_SRE_Match_expand_impl(MatchObject *self, PyObject *template);
 
 static PyObject *
-_sre_SRE_Match_expand(MatchObject *self, PyObject *args, PyObject *kwargs)
+_sre_SRE_Match_expand(MatchObject *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"template", NULL};
     static _PyArg_Parser _parser = {"O:expand", _keywords, 0};
     PyObject *template;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &template)) {
         goto exit;
     }
@@ -496,20 +496,20 @@
 "    Is used for groups that did not participate in the match.");
 
 #define _SRE_SRE_MATCH_GROUPS_METHODDEF    \
-    {"groups", (PyCFunction)_sre_SRE_Match_groups, METH_VARARGS|METH_KEYWORDS, _sre_SRE_Match_groups__doc__},
+    {"groups", (PyCFunction)_sre_SRE_Match_groups, METH_FASTCALL, _sre_SRE_Match_groups__doc__},
 
 static PyObject *
 _sre_SRE_Match_groups_impl(MatchObject *self, PyObject *default_value);
 
 static PyObject *
-_sre_SRE_Match_groups(MatchObject *self, PyObject *args, PyObject *kwargs)
+_sre_SRE_Match_groups(MatchObject *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"default", NULL};
     static _PyArg_Parser _parser = {"|O:groups", _keywords, 0};
     PyObject *default_value = Py_None;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &default_value)) {
         goto exit;
     }
@@ -529,20 +529,20 @@
 "    Is used for groups that did not participate in the match.");
 
 #define _SRE_SRE_MATCH_GROUPDICT_METHODDEF    \
-    {"groupdict", (PyCFunction)_sre_SRE_Match_groupdict, METH_VARARGS|METH_KEYWORDS, _sre_SRE_Match_groupdict__doc__},
+    {"groupdict", (PyCFunction)_sre_SRE_Match_groupdict, METH_FASTCALL, _sre_SRE_Match_groupdict__doc__},
 
 static PyObject *
 _sre_SRE_Match_groupdict_impl(MatchObject *self, PyObject *default_value);
 
 static PyObject *
-_sre_SRE_Match_groupdict(MatchObject *self, PyObject *args, PyObject *kwargs)
+_sre_SRE_Match_groupdict(MatchObject *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"default", NULL};
     static _PyArg_Parser _parser = {"|O:groupdict", _keywords, 0};
     PyObject *default_value = Py_None;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &default_value)) {
         goto exit;
     }
@@ -672,20 +672,20 @@
 "\n");
 
 #define _SRE_SRE_MATCH___DEEPCOPY___METHODDEF    \
-    {"__deepcopy__", (PyCFunction)_sre_SRE_Match___deepcopy__, METH_VARARGS|METH_KEYWORDS, _sre_SRE_Match___deepcopy____doc__},
+    {"__deepcopy__", (PyCFunction)_sre_SRE_Match___deepcopy__, METH_FASTCALL, _sre_SRE_Match___deepcopy____doc__},
 
 static PyObject *
 _sre_SRE_Match___deepcopy___impl(MatchObject *self, PyObject *memo);
 
 static PyObject *
-_sre_SRE_Match___deepcopy__(MatchObject *self, PyObject *args, PyObject *kwargs)
+_sre_SRE_Match___deepcopy__(MatchObject *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"memo", NULL};
     static _PyArg_Parser _parser = {"O:__deepcopy__", _keywords, 0};
     PyObject *memo;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &memo)) {
         goto exit;
     }
@@ -728,4 +728,4 @@
 {
     return _sre_SRE_Scanner_search_impl(self);
 }
-/*[clinic end generated code: output=2cbc2b1482738e54 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=a4a246bca1963bc9 input=a9049054013a1b77]*/
diff --git a/Modules/clinic/_ssl.c.h b/Modules/clinic/_ssl.c.h
index ee8213a..29f5838 100644
--- a/Modules/clinic/_ssl.c.h
+++ b/Modules/clinic/_ssl.c.h
@@ -469,14 +469,14 @@
 "\n");
 
 #define _SSL__SSLCONTEXT_LOAD_CERT_CHAIN_METHODDEF    \
-    {"load_cert_chain", (PyCFunction)_ssl__SSLContext_load_cert_chain, METH_VARARGS|METH_KEYWORDS, _ssl__SSLContext_load_cert_chain__doc__},
+    {"load_cert_chain", (PyCFunction)_ssl__SSLContext_load_cert_chain, METH_FASTCALL, _ssl__SSLContext_load_cert_chain__doc__},
 
 static PyObject *
 _ssl__SSLContext_load_cert_chain_impl(PySSLContext *self, PyObject *certfile,
                                       PyObject *keyfile, PyObject *password);
 
 static PyObject *
-_ssl__SSLContext_load_cert_chain(PySSLContext *self, PyObject *args, PyObject *kwargs)
+_ssl__SSLContext_load_cert_chain(PySSLContext *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"certfile", "keyfile", "password", NULL};
@@ -485,7 +485,7 @@
     PyObject *keyfile = NULL;
     PyObject *password = NULL;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &certfile, &keyfile, &password)) {
         goto exit;
     }
@@ -501,7 +501,7 @@
 "\n");
 
 #define _SSL__SSLCONTEXT_LOAD_VERIFY_LOCATIONS_METHODDEF    \
-    {"load_verify_locations", (PyCFunction)_ssl__SSLContext_load_verify_locations, METH_VARARGS|METH_KEYWORDS, _ssl__SSLContext_load_verify_locations__doc__},
+    {"load_verify_locations", (PyCFunction)_ssl__SSLContext_load_verify_locations, METH_FASTCALL, _ssl__SSLContext_load_verify_locations__doc__},
 
 static PyObject *
 _ssl__SSLContext_load_verify_locations_impl(PySSLContext *self,
@@ -510,7 +510,7 @@
                                             PyObject *cadata);
 
 static PyObject *
-_ssl__SSLContext_load_verify_locations(PySSLContext *self, PyObject *args, PyObject *kwargs)
+_ssl__SSLContext_load_verify_locations(PySSLContext *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"cafile", "capath", "cadata", NULL};
@@ -519,7 +519,7 @@
     PyObject *capath = NULL;
     PyObject *cadata = NULL;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &cafile, &capath, &cadata)) {
         goto exit;
     }
@@ -543,14 +543,14 @@
 "\n");
 
 #define _SSL__SSLCONTEXT__WRAP_SOCKET_METHODDEF    \
-    {"_wrap_socket", (PyCFunction)_ssl__SSLContext__wrap_socket, METH_VARARGS|METH_KEYWORDS, _ssl__SSLContext__wrap_socket__doc__},
+    {"_wrap_socket", (PyCFunction)_ssl__SSLContext__wrap_socket, METH_FASTCALL, _ssl__SSLContext__wrap_socket__doc__},
 
 static PyObject *
 _ssl__SSLContext__wrap_socket_impl(PySSLContext *self, PyObject *sock,
                                    int server_side, PyObject *hostname_obj);
 
 static PyObject *
-_ssl__SSLContext__wrap_socket(PySSLContext *self, PyObject *args, PyObject *kwargs)
+_ssl__SSLContext__wrap_socket(PySSLContext *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"sock", "server_side", "server_hostname", NULL};
@@ -559,7 +559,7 @@
     int server_side;
     PyObject *hostname_obj = Py_None;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         PySocketModule.Sock_Type, &sock, &server_side, &hostname_obj)) {
         goto exit;
     }
@@ -576,7 +576,7 @@
 "\n");
 
 #define _SSL__SSLCONTEXT__WRAP_BIO_METHODDEF    \
-    {"_wrap_bio", (PyCFunction)_ssl__SSLContext__wrap_bio, METH_VARARGS|METH_KEYWORDS, _ssl__SSLContext__wrap_bio__doc__},
+    {"_wrap_bio", (PyCFunction)_ssl__SSLContext__wrap_bio, METH_FASTCALL, _ssl__SSLContext__wrap_bio__doc__},
 
 static PyObject *
 _ssl__SSLContext__wrap_bio_impl(PySSLContext *self, PySSLMemoryBIO *incoming,
@@ -584,7 +584,7 @@
                                 PyObject *hostname_obj);
 
 static PyObject *
-_ssl__SSLContext__wrap_bio(PySSLContext *self, PyObject *args, PyObject *kwargs)
+_ssl__SSLContext__wrap_bio(PySSLContext *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"incoming", "outgoing", "server_side", "server_hostname", NULL};
@@ -594,7 +594,7 @@
     int server_side;
     PyObject *hostname_obj = Py_None;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &PySSLMemoryBIO_Type, &incoming, &PySSLMemoryBIO_Type, &outgoing, &server_side, &hostname_obj)) {
         goto exit;
     }
@@ -700,20 +700,20 @@
 "been used at least once.");
 
 #define _SSL__SSLCONTEXT_GET_CA_CERTS_METHODDEF    \
-    {"get_ca_certs", (PyCFunction)_ssl__SSLContext_get_ca_certs, METH_VARARGS|METH_KEYWORDS, _ssl__SSLContext_get_ca_certs__doc__},
+    {"get_ca_certs", (PyCFunction)_ssl__SSLContext_get_ca_certs, METH_FASTCALL, _ssl__SSLContext_get_ca_certs__doc__},
 
 static PyObject *
 _ssl__SSLContext_get_ca_certs_impl(PySSLContext *self, int binary_form);
 
 static PyObject *
-_ssl__SSLContext_get_ca_certs(PySSLContext *self, PyObject *args, PyObject *kwargs)
+_ssl__SSLContext_get_ca_certs(PySSLContext *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"binary_form", NULL};
     static _PyArg_Parser _parser = {"|p:get_ca_certs", _keywords, 0};
     int binary_form = 0;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &binary_form)) {
         goto exit;
     }
@@ -1011,13 +1011,13 @@
 "long name are also matched.");
 
 #define _SSL_TXT2OBJ_METHODDEF    \
-    {"txt2obj", (PyCFunction)_ssl_txt2obj, METH_VARARGS|METH_KEYWORDS, _ssl_txt2obj__doc__},
+    {"txt2obj", (PyCFunction)_ssl_txt2obj, METH_FASTCALL, _ssl_txt2obj__doc__},
 
 static PyObject *
 _ssl_txt2obj_impl(PyObject *module, const char *txt, int name);
 
 static PyObject *
-_ssl_txt2obj(PyObject *module, PyObject *args, PyObject *kwargs)
+_ssl_txt2obj(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"txt", "name", NULL};
@@ -1025,7 +1025,7 @@
     const char *txt;
     int name = 0;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &txt, &name)) {
         goto exit;
     }
@@ -1077,20 +1077,20 @@
 "a set of OIDs or the boolean True.");
 
 #define _SSL_ENUM_CERTIFICATES_METHODDEF    \
-    {"enum_certificates", (PyCFunction)_ssl_enum_certificates, METH_VARARGS|METH_KEYWORDS, _ssl_enum_certificates__doc__},
+    {"enum_certificates", (PyCFunction)_ssl_enum_certificates, METH_FASTCALL, _ssl_enum_certificates__doc__},
 
 static PyObject *
 _ssl_enum_certificates_impl(PyObject *module, const char *store_name);
 
 static PyObject *
-_ssl_enum_certificates(PyObject *module, PyObject *args, PyObject *kwargs)
+_ssl_enum_certificates(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"store_name", NULL};
     static _PyArg_Parser _parser = {"s:enum_certificates", _keywords, 0};
     const char *store_name;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &store_name)) {
         goto exit;
     }
@@ -1116,20 +1116,20 @@
 "X509_ASN_ENCODING or PKCS_7_ASN_ENCODING.");
 
 #define _SSL_ENUM_CRLS_METHODDEF    \
-    {"enum_crls", (PyCFunction)_ssl_enum_crls, METH_VARARGS|METH_KEYWORDS, _ssl_enum_crls__doc__},
+    {"enum_crls", (PyCFunction)_ssl_enum_crls, METH_FASTCALL, _ssl_enum_crls__doc__},
 
 static PyObject *
 _ssl_enum_crls_impl(PyObject *module, const char *store_name);
 
 static PyObject *
-_ssl_enum_crls(PyObject *module, PyObject *args, PyObject *kwargs)
+_ssl_enum_crls(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"store_name", NULL};
     static _PyArg_Parser _parser = {"s:enum_crls", _keywords, 0};
     const char *store_name;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &store_name)) {
         goto exit;
     }
@@ -1168,4 +1168,4 @@
 #ifndef _SSL_ENUM_CRLS_METHODDEF
     #define _SSL_ENUM_CRLS_METHODDEF
 #endif /* !defined(_SSL_ENUM_CRLS_METHODDEF) */
-/*[clinic end generated code: output=2e7907a7d8f97ccf input=a9049054013a1b77]*/
+/*[clinic end generated code: output=a859b21fe68a6115 input=a9049054013a1b77]*/
diff --git a/Modules/clinic/_winapi.c.h b/Modules/clinic/_winapi.c.h
index 44d48a9..5bfbaf0 100644
--- a/Modules/clinic/_winapi.c.h
+++ b/Modules/clinic/_winapi.c.h
@@ -95,14 +95,14 @@
 "\n");
 
 #define _WINAPI_CONNECTNAMEDPIPE_METHODDEF    \
-    {"ConnectNamedPipe", (PyCFunction)_winapi_ConnectNamedPipe, METH_VARARGS|METH_KEYWORDS, _winapi_ConnectNamedPipe__doc__},
+    {"ConnectNamedPipe", (PyCFunction)_winapi_ConnectNamedPipe, METH_FASTCALL, _winapi_ConnectNamedPipe__doc__},
 
 static PyObject *
 _winapi_ConnectNamedPipe_impl(PyObject *module, HANDLE handle,
                               int use_overlapped);
 
 static PyObject *
-_winapi_ConnectNamedPipe(PyObject *module, PyObject *args, PyObject *kwargs)
+_winapi_ConnectNamedPipe(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"handle", "overlapped", NULL};
@@ -110,7 +110,7 @@
     HANDLE handle;
     int use_overlapped = 0;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &handle, &use_overlapped)) {
         goto exit;
     }
@@ -670,14 +670,14 @@
 "\n");
 
 #define _WINAPI_READFILE_METHODDEF    \
-    {"ReadFile", (PyCFunction)_winapi_ReadFile, METH_VARARGS|METH_KEYWORDS, _winapi_ReadFile__doc__},
+    {"ReadFile", (PyCFunction)_winapi_ReadFile, METH_FASTCALL, _winapi_ReadFile__doc__},
 
 static PyObject *
 _winapi_ReadFile_impl(PyObject *module, HANDLE handle, int size,
                       int use_overlapped);
 
 static PyObject *
-_winapi_ReadFile(PyObject *module, PyObject *args, PyObject *kwargs)
+_winapi_ReadFile(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"handle", "size", "overlapped", NULL};
@@ -686,7 +686,7 @@
     int size;
     int use_overlapped = 0;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &handle, &size, &use_overlapped)) {
         goto exit;
     }
@@ -864,14 +864,14 @@
 "\n");
 
 #define _WINAPI_WRITEFILE_METHODDEF    \
-    {"WriteFile", (PyCFunction)_winapi_WriteFile, METH_VARARGS|METH_KEYWORDS, _winapi_WriteFile__doc__},
+    {"WriteFile", (PyCFunction)_winapi_WriteFile, METH_FASTCALL, _winapi_WriteFile__doc__},
 
 static PyObject *
 _winapi_WriteFile_impl(PyObject *module, HANDLE handle, PyObject *buffer,
                        int use_overlapped);
 
 static PyObject *
-_winapi_WriteFile(PyObject *module, PyObject *args, PyObject *kwargs)
+_winapi_WriteFile(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"handle", "buffer", "overlapped", NULL};
@@ -880,7 +880,7 @@
     PyObject *buffer;
     int use_overlapped = 0;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &handle, &buffer, &use_overlapped)) {
         goto exit;
     }
@@ -889,4 +889,4 @@
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=4bfccfb32ab726e8 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=46d6382a6662c4a9 input=a9049054013a1b77]*/
diff --git a/Modules/clinic/binascii.c.h b/Modules/clinic/binascii.c.h
index 0ee7f57..acafcbf 100644
--- a/Modules/clinic/binascii.c.h
+++ b/Modules/clinic/binascii.c.h
@@ -103,13 +103,13 @@
 "Base64-code line of data.");
 
 #define BINASCII_B2A_BASE64_METHODDEF    \
-    {"b2a_base64", (PyCFunction)binascii_b2a_base64, METH_VARARGS|METH_KEYWORDS, binascii_b2a_base64__doc__},
+    {"b2a_base64", (PyCFunction)binascii_b2a_base64, METH_FASTCALL, binascii_b2a_base64__doc__},
 
 static PyObject *
 binascii_b2a_base64_impl(PyObject *module, Py_buffer *data, int newline);
 
 static PyObject *
-binascii_b2a_base64(PyObject *module, PyObject *args, PyObject *kwargs)
+binascii_b2a_base64(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"data", "newline", NULL};
@@ -117,7 +117,7 @@
     Py_buffer data = {NULL, NULL};
     int newline = 1;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &data, &newline)) {
         goto exit;
     }
@@ -480,13 +480,13 @@
 "Decode a string of qp-encoded data.");
 
 #define BINASCII_A2B_QP_METHODDEF    \
-    {"a2b_qp", (PyCFunction)binascii_a2b_qp, METH_VARARGS|METH_KEYWORDS, binascii_a2b_qp__doc__},
+    {"a2b_qp", (PyCFunction)binascii_a2b_qp, METH_FASTCALL, binascii_a2b_qp__doc__},
 
 static PyObject *
 binascii_a2b_qp_impl(PyObject *module, Py_buffer *data, int header);
 
 static PyObject *
-binascii_a2b_qp(PyObject *module, PyObject *args, PyObject *kwargs)
+binascii_a2b_qp(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"data", "header", NULL};
@@ -494,7 +494,7 @@
     Py_buffer data = {NULL, NULL};
     int header = 0;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         ascii_buffer_converter, &data, &header)) {
         goto exit;
     }
@@ -519,14 +519,14 @@
 "are both encoded.  When quotetabs is set, space and tabs are encoded.");
 
 #define BINASCII_B2A_QP_METHODDEF    \
-    {"b2a_qp", (PyCFunction)binascii_b2a_qp, METH_VARARGS|METH_KEYWORDS, binascii_b2a_qp__doc__},
+    {"b2a_qp", (PyCFunction)binascii_b2a_qp, METH_FASTCALL, binascii_b2a_qp__doc__},
 
 static PyObject *
 binascii_b2a_qp_impl(PyObject *module, Py_buffer *data, int quotetabs,
                      int istext, int header);
 
 static PyObject *
-binascii_b2a_qp(PyObject *module, PyObject *args, PyObject *kwargs)
+binascii_b2a_qp(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"data", "quotetabs", "istext", "header", NULL};
@@ -536,7 +536,7 @@
     int istext = 1;
     int header = 0;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &data, &quotetabs, &istext, &header)) {
         goto exit;
     }
@@ -550,4 +550,4 @@
 
     return return_value;
 }
-/*[clinic end generated code: output=12611b05d8bf4a9c input=a9049054013a1b77]*/
+/*[clinic end generated code: output=1f8d6e48f75f6d1e input=a9049054013a1b77]*/
diff --git a/Modules/clinic/cmathmodule.c.h b/Modules/clinic/cmathmodule.c.h
index e46c314..05431fa 100644
--- a/Modules/clinic/cmathmodule.c.h
+++ b/Modules/clinic/cmathmodule.c.h
@@ -851,14 +851,14 @@
 "not close to anything, even itself. inf and -inf are only close to themselves.");
 
 #define CMATH_ISCLOSE_METHODDEF    \
-    {"isclose", (PyCFunction)cmath_isclose, METH_VARARGS|METH_KEYWORDS, cmath_isclose__doc__},
+    {"isclose", (PyCFunction)cmath_isclose, METH_FASTCALL, cmath_isclose__doc__},
 
 static int
 cmath_isclose_impl(PyObject *module, Py_complex a, Py_complex b,
                    double rel_tol, double abs_tol);
 
 static PyObject *
-cmath_isclose(PyObject *module, PyObject *args, PyObject *kwargs)
+cmath_isclose(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"a", "b", "rel_tol", "abs_tol", NULL};
@@ -869,7 +869,7 @@
     double abs_tol = 0.0;
     int _return_value;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &a, &b, &rel_tol, &abs_tol)) {
         goto exit;
     }
@@ -882,4 +882,4 @@
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=aa2e77ca9fc26928 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=978f59702b41655f input=a9049054013a1b77]*/
diff --git a/Modules/clinic/grpmodule.c.h b/Modules/clinic/grpmodule.c.h
index 9c9d595..0282b4e 100644
--- a/Modules/clinic/grpmodule.c.h
+++ b/Modules/clinic/grpmodule.c.h
@@ -11,20 +11,20 @@
 "If id is not valid, raise KeyError.");
 
 #define GRP_GETGRGID_METHODDEF    \
-    {"getgrgid", (PyCFunction)grp_getgrgid, METH_VARARGS|METH_KEYWORDS, grp_getgrgid__doc__},
+    {"getgrgid", (PyCFunction)grp_getgrgid, METH_FASTCALL, grp_getgrgid__doc__},
 
 static PyObject *
 grp_getgrgid_impl(PyObject *module, PyObject *id);
 
 static PyObject *
-grp_getgrgid(PyObject *module, PyObject *args, PyObject *kwargs)
+grp_getgrgid(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"id", NULL};
     static _PyArg_Parser _parser = {"O:getgrgid", _keywords, 0};
     PyObject *id;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &id)) {
         goto exit;
     }
@@ -43,20 +43,20 @@
 "If name is not valid, raise KeyError.");
 
 #define GRP_GETGRNAM_METHODDEF    \
-    {"getgrnam", (PyCFunction)grp_getgrnam, METH_VARARGS|METH_KEYWORDS, grp_getgrnam__doc__},
+    {"getgrnam", (PyCFunction)grp_getgrnam, METH_FASTCALL, grp_getgrnam__doc__},
 
 static PyObject *
 grp_getgrnam_impl(PyObject *module, PyObject *name);
 
 static PyObject *
-grp_getgrnam(PyObject *module, PyObject *args, PyObject *kwargs)
+grp_getgrnam(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"name", NULL};
     static _PyArg_Parser _parser = {"U:getgrnam", _keywords, 0};
     PyObject *name;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &name)) {
         goto exit;
     }
@@ -86,4 +86,4 @@
 {
     return grp_getgrall_impl(module);
 }
-/*[clinic end generated code: output=c06081097b7fffe7 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=d6417ae0a7298e0e input=a9049054013a1b77]*/
diff --git a/Modules/clinic/md5module.c.h b/Modules/clinic/md5module.c.h
index aeb1c41..a841fe5 100644
--- a/Modules/clinic/md5module.c.h
+++ b/Modules/clinic/md5module.c.h
@@ -72,20 +72,20 @@
 "Return a new MD5 hash object; optionally initialized with a string.");
 
 #define _MD5_MD5_METHODDEF    \
-    {"md5", (PyCFunction)_md5_md5, METH_VARARGS|METH_KEYWORDS, _md5_md5__doc__},
+    {"md5", (PyCFunction)_md5_md5, METH_FASTCALL, _md5_md5__doc__},
 
 static PyObject *
 _md5_md5_impl(PyObject *module, PyObject *string);
 
 static PyObject *
-_md5_md5(PyObject *module, PyObject *args, PyObject *kwargs)
+_md5_md5(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"string", NULL};
     static _PyArg_Parser _parser = {"|O:md5", _keywords, 0};
     PyObject *string = NULL;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &string)) {
         goto exit;
     }
@@ -94,4 +94,4 @@
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=f86fc2f3f21831e2 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=54cd50db050f2589 input=a9049054013a1b77]*/
diff --git a/Modules/clinic/posixmodule.c.h b/Modules/clinic/posixmodule.c.h
index 6088eec..fdb3970 100644
--- a/Modules/clinic/posixmodule.c.h
+++ b/Modules/clinic/posixmodule.c.h
@@ -27,13 +27,13 @@
 "  an open file descriptor.");
 
 #define OS_STAT_METHODDEF    \
-    {"stat", (PyCFunction)os_stat, METH_VARARGS|METH_KEYWORDS, os_stat__doc__},
+    {"stat", (PyCFunction)os_stat, METH_FASTCALL, os_stat__doc__},
 
 static PyObject *
 os_stat_impl(PyObject *module, path_t *path, int dir_fd, int follow_symlinks);
 
 static PyObject *
-os_stat(PyObject *module, PyObject *args, PyObject *kwargs)
+os_stat(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"path", "dir_fd", "follow_symlinks", NULL};
@@ -42,7 +42,7 @@
     int dir_fd = DEFAULT_DIR_FD;
     int follow_symlinks = 1;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         path_converter, &path, FSTATAT_DIR_FD_CONVERTER, &dir_fd, &follow_symlinks)) {
         goto exit;
     }
@@ -65,13 +65,13 @@
 "Equivalent to stat(path, follow_symlinks=False).");
 
 #define OS_LSTAT_METHODDEF    \
-    {"lstat", (PyCFunction)os_lstat, METH_VARARGS|METH_KEYWORDS, os_lstat__doc__},
+    {"lstat", (PyCFunction)os_lstat, METH_FASTCALL, os_lstat__doc__},
 
 static PyObject *
 os_lstat_impl(PyObject *module, path_t *path, int dir_fd);
 
 static PyObject *
-os_lstat(PyObject *module, PyObject *args, PyObject *kwargs)
+os_lstat(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"path", "dir_fd", NULL};
@@ -79,7 +79,7 @@
     path_t path = PATH_T_INITIALIZE("lstat", "path", 0, 0);
     int dir_fd = DEFAULT_DIR_FD;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         path_converter, &path, FSTATAT_DIR_FD_CONVERTER, &dir_fd)) {
         goto exit;
     }
@@ -125,14 +125,14 @@
 "  has the specified access to the path.");
 
 #define OS_ACCESS_METHODDEF    \
-    {"access", (PyCFunction)os_access, METH_VARARGS|METH_KEYWORDS, os_access__doc__},
+    {"access", (PyCFunction)os_access, METH_FASTCALL, os_access__doc__},
 
 static int
 os_access_impl(PyObject *module, path_t *path, int mode, int dir_fd,
                int effective_ids, int follow_symlinks);
 
 static PyObject *
-os_access(PyObject *module, PyObject *args, PyObject *kwargs)
+os_access(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"path", "mode", "dir_fd", "effective_ids", "follow_symlinks", NULL};
@@ -144,7 +144,7 @@
     int follow_symlinks = 1;
     int _return_value;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         path_converter, &path, &mode, FACCESSAT_DIR_FD_CONVERTER, &dir_fd, &effective_ids, &follow_symlinks)) {
         goto exit;
     }
@@ -233,20 +233,20 @@
 "  If this functionality is unavailable, using it raises an exception.");
 
 #define OS_CHDIR_METHODDEF    \
-    {"chdir", (PyCFunction)os_chdir, METH_VARARGS|METH_KEYWORDS, os_chdir__doc__},
+    {"chdir", (PyCFunction)os_chdir, METH_FASTCALL, os_chdir__doc__},
 
 static PyObject *
 os_chdir_impl(PyObject *module, path_t *path);
 
 static PyObject *
-os_chdir(PyObject *module, PyObject *args, PyObject *kwargs)
+os_chdir(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"path", NULL};
     static _PyArg_Parser _parser = {"O&:chdir", _keywords, 0};
     path_t path = PATH_T_INITIALIZE("chdir", "path", 0, PATH_HAVE_FCHDIR);
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         path_converter, &path)) {
         goto exit;
     }
@@ -271,20 +271,20 @@
 "Equivalent to os.chdir(fd).");
 
 #define OS_FCHDIR_METHODDEF    \
-    {"fchdir", (PyCFunction)os_fchdir, METH_VARARGS|METH_KEYWORDS, os_fchdir__doc__},
+    {"fchdir", (PyCFunction)os_fchdir, METH_FASTCALL, os_fchdir__doc__},
 
 static PyObject *
 os_fchdir_impl(PyObject *module, int fd);
 
 static PyObject *
-os_fchdir(PyObject *module, PyObject *args, PyObject *kwargs)
+os_fchdir(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"fd", NULL};
     static _PyArg_Parser _parser = {"O&:fchdir", _keywords, 0};
     int fd;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         fildes_converter, &fd)) {
         goto exit;
     }
@@ -323,14 +323,14 @@
 "  If they are unavailable, using them will raise a NotImplementedError.");
 
 #define OS_CHMOD_METHODDEF    \
-    {"chmod", (PyCFunction)os_chmod, METH_VARARGS|METH_KEYWORDS, os_chmod__doc__},
+    {"chmod", (PyCFunction)os_chmod, METH_FASTCALL, os_chmod__doc__},
 
 static PyObject *
 os_chmod_impl(PyObject *module, path_t *path, int mode, int dir_fd,
               int follow_symlinks);
 
 static PyObject *
-os_chmod(PyObject *module, PyObject *args, PyObject *kwargs)
+os_chmod(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"path", "mode", "dir_fd", "follow_symlinks", NULL};
@@ -340,7 +340,7 @@
     int dir_fd = DEFAULT_DIR_FD;
     int follow_symlinks = 1;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         path_converter, &path, &mode, FCHMODAT_DIR_FD_CONVERTER, &dir_fd, &follow_symlinks)) {
         goto exit;
     }
@@ -364,13 +364,13 @@
 "Equivalent to os.chmod(fd, mode).");
 
 #define OS_FCHMOD_METHODDEF    \
-    {"fchmod", (PyCFunction)os_fchmod, METH_VARARGS|METH_KEYWORDS, os_fchmod__doc__},
+    {"fchmod", (PyCFunction)os_fchmod, METH_FASTCALL, os_fchmod__doc__},
 
 static PyObject *
 os_fchmod_impl(PyObject *module, int fd, int mode);
 
 static PyObject *
-os_fchmod(PyObject *module, PyObject *args, PyObject *kwargs)
+os_fchmod(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"fd", "mode", NULL};
@@ -378,7 +378,7 @@
     int fd;
     int mode;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &fd, &mode)) {
         goto exit;
     }
@@ -402,13 +402,13 @@
 "Equivalent to chmod(path, mode, follow_symlinks=False).\"");
 
 #define OS_LCHMOD_METHODDEF    \
-    {"lchmod", (PyCFunction)os_lchmod, METH_VARARGS|METH_KEYWORDS, os_lchmod__doc__},
+    {"lchmod", (PyCFunction)os_lchmod, METH_FASTCALL, os_lchmod__doc__},
 
 static PyObject *
 os_lchmod_impl(PyObject *module, path_t *path, int mode);
 
 static PyObject *
-os_lchmod(PyObject *module, PyObject *args, PyObject *kwargs)
+os_lchmod(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"path", "mode", NULL};
@@ -416,7 +416,7 @@
     path_t path = PATH_T_INITIALIZE("lchmod", "path", 0, 0);
     int mode;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         path_converter, &path, &mode)) {
         goto exit;
     }
@@ -446,14 +446,14 @@
 "unavailable, using it will raise a NotImplementedError.");
 
 #define OS_CHFLAGS_METHODDEF    \
-    {"chflags", (PyCFunction)os_chflags, METH_VARARGS|METH_KEYWORDS, os_chflags__doc__},
+    {"chflags", (PyCFunction)os_chflags, METH_FASTCALL, os_chflags__doc__},
 
 static PyObject *
 os_chflags_impl(PyObject *module, path_t *path, unsigned long flags,
                 int follow_symlinks);
 
 static PyObject *
-os_chflags(PyObject *module, PyObject *args, PyObject *kwargs)
+os_chflags(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"path", "flags", "follow_symlinks", NULL};
@@ -462,7 +462,7 @@
     unsigned long flags;
     int follow_symlinks = 1;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         path_converter, &path, &flags, &follow_symlinks)) {
         goto exit;
     }
@@ -489,13 +489,13 @@
 "Equivalent to chflags(path, flags, follow_symlinks=False).");
 
 #define OS_LCHFLAGS_METHODDEF    \
-    {"lchflags", (PyCFunction)os_lchflags, METH_VARARGS|METH_KEYWORDS, os_lchflags__doc__},
+    {"lchflags", (PyCFunction)os_lchflags, METH_FASTCALL, os_lchflags__doc__},
 
 static PyObject *
 os_lchflags_impl(PyObject *module, path_t *path, unsigned long flags);
 
 static PyObject *
-os_lchflags(PyObject *module, PyObject *args, PyObject *kwargs)
+os_lchflags(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"path", "flags", NULL};
@@ -503,7 +503,7 @@
     path_t path = PATH_T_INITIALIZE("lchflags", "path", 0, 0);
     unsigned long flags;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         path_converter, &path, &flags)) {
         goto exit;
     }
@@ -527,20 +527,20 @@
 "Change root directory to path.");
 
 #define OS_CHROOT_METHODDEF    \
-    {"chroot", (PyCFunction)os_chroot, METH_VARARGS|METH_KEYWORDS, os_chroot__doc__},
+    {"chroot", (PyCFunction)os_chroot, METH_FASTCALL, os_chroot__doc__},
 
 static PyObject *
 os_chroot_impl(PyObject *module, path_t *path);
 
 static PyObject *
-os_chroot(PyObject *module, PyObject *args, PyObject *kwargs)
+os_chroot(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"path", NULL};
     static _PyArg_Parser _parser = {"O&:chroot", _keywords, 0};
     path_t path = PATH_T_INITIALIZE("chroot", "path", 0, 0);
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         path_converter, &path)) {
         goto exit;
     }
@@ -564,20 +564,20 @@
 "Force write of fd to disk.");
 
 #define OS_FSYNC_METHODDEF    \
-    {"fsync", (PyCFunction)os_fsync, METH_VARARGS|METH_KEYWORDS, os_fsync__doc__},
+    {"fsync", (PyCFunction)os_fsync, METH_FASTCALL, os_fsync__doc__},
 
 static PyObject *
 os_fsync_impl(PyObject *module, int fd);
 
 static PyObject *
-os_fsync(PyObject *module, PyObject *args, PyObject *kwargs)
+os_fsync(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"fd", NULL};
     static _PyArg_Parser _parser = {"O&:fsync", _keywords, 0};
     int fd;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         fildes_converter, &fd)) {
         goto exit;
     }
@@ -620,20 +620,20 @@
 "Force write of fd to disk without forcing update of metadata.");
 
 #define OS_FDATASYNC_METHODDEF    \
-    {"fdatasync", (PyCFunction)os_fdatasync, METH_VARARGS|METH_KEYWORDS, os_fdatasync__doc__},
+    {"fdatasync", (PyCFunction)os_fdatasync, METH_FASTCALL, os_fdatasync__doc__},
 
 static PyObject *
 os_fdatasync_impl(PyObject *module, int fd);
 
 static PyObject *
-os_fdatasync(PyObject *module, PyObject *args, PyObject *kwargs)
+os_fdatasync(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"fd", NULL};
     static _PyArg_Parser _parser = {"O&:fdatasync", _keywords, 0};
     int fd;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         fildes_converter, &fd)) {
         goto exit;
     }
@@ -678,14 +678,14 @@
 "  If they are unavailable, using them will raise a NotImplementedError.");
 
 #define OS_CHOWN_METHODDEF    \
-    {"chown", (PyCFunction)os_chown, METH_VARARGS|METH_KEYWORDS, os_chown__doc__},
+    {"chown", (PyCFunction)os_chown, METH_FASTCALL, os_chown__doc__},
 
 static PyObject *
 os_chown_impl(PyObject *module, path_t *path, uid_t uid, gid_t gid,
               int dir_fd, int follow_symlinks);
 
 static PyObject *
-os_chown(PyObject *module, PyObject *args, PyObject *kwargs)
+os_chown(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"path", "uid", "gid", "dir_fd", "follow_symlinks", NULL};
@@ -696,7 +696,7 @@
     int dir_fd = DEFAULT_DIR_FD;
     int follow_symlinks = 1;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         path_converter, &path, _Py_Uid_Converter, &uid, _Py_Gid_Converter, &gid, FCHOWNAT_DIR_FD_CONVERTER, &dir_fd, &follow_symlinks)) {
         goto exit;
     }
@@ -722,13 +722,13 @@
 "Equivalent to os.chown(fd, uid, gid).");
 
 #define OS_FCHOWN_METHODDEF    \
-    {"fchown", (PyCFunction)os_fchown, METH_VARARGS|METH_KEYWORDS, os_fchown__doc__},
+    {"fchown", (PyCFunction)os_fchown, METH_FASTCALL, os_fchown__doc__},
 
 static PyObject *
 os_fchown_impl(PyObject *module, int fd, uid_t uid, gid_t gid);
 
 static PyObject *
-os_fchown(PyObject *module, PyObject *args, PyObject *kwargs)
+os_fchown(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"fd", "uid", "gid", NULL};
@@ -737,7 +737,7 @@
     uid_t uid;
     gid_t gid;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &fd, _Py_Uid_Converter, &uid, _Py_Gid_Converter, &gid)) {
         goto exit;
     }
@@ -761,13 +761,13 @@
 "Equivalent to os.chown(path, uid, gid, follow_symlinks=False).");
 
 #define OS_LCHOWN_METHODDEF    \
-    {"lchown", (PyCFunction)os_lchown, METH_VARARGS|METH_KEYWORDS, os_lchown__doc__},
+    {"lchown", (PyCFunction)os_lchown, METH_FASTCALL, os_lchown__doc__},
 
 static PyObject *
 os_lchown_impl(PyObject *module, path_t *path, uid_t uid, gid_t gid);
 
 static PyObject *
-os_lchown(PyObject *module, PyObject *args, PyObject *kwargs)
+os_lchown(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"path", "uid", "gid", NULL};
@@ -776,7 +776,7 @@
     uid_t uid;
     gid_t gid;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         path_converter, &path, _Py_Uid_Converter, &uid, _Py_Gid_Converter, &gid)) {
         goto exit;
     }
@@ -847,14 +847,14 @@
 "  NotImplementedError.");
 
 #define OS_LINK_METHODDEF    \
-    {"link", (PyCFunction)os_link, METH_VARARGS|METH_KEYWORDS, os_link__doc__},
+    {"link", (PyCFunction)os_link, METH_FASTCALL, os_link__doc__},
 
 static PyObject *
 os_link_impl(PyObject *module, path_t *src, path_t *dst, int src_dir_fd,
              int dst_dir_fd, int follow_symlinks);
 
 static PyObject *
-os_link(PyObject *module, PyObject *args, PyObject *kwargs)
+os_link(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"src", "dst", "src_dir_fd", "dst_dir_fd", "follow_symlinks", NULL};
@@ -865,7 +865,7 @@
     int dst_dir_fd = DEFAULT_DIR_FD;
     int follow_symlinks = 1;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         path_converter, &src, path_converter, &dst, dir_fd_converter, &src_dir_fd, dir_fd_converter, &dst_dir_fd, &follow_symlinks)) {
         goto exit;
     }
@@ -900,20 +900,20 @@
 "entries \'.\' and \'..\' even if they are present in the directory.");
 
 #define OS_LISTDIR_METHODDEF    \
-    {"listdir", (PyCFunction)os_listdir, METH_VARARGS|METH_KEYWORDS, os_listdir__doc__},
+    {"listdir", (PyCFunction)os_listdir, METH_FASTCALL, os_listdir__doc__},
 
 static PyObject *
 os_listdir_impl(PyObject *module, path_t *path);
 
 static PyObject *
-os_listdir(PyObject *module, PyObject *args, PyObject *kwargs)
+os_listdir(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"path", NULL};
     static _PyArg_Parser _parser = {"|O&:listdir", _keywords, 0};
     path_t path = PATH_T_INITIALIZE("listdir", "path", 1, PATH_HAVE_FDOPENDIR);
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         path_converter, &path)) {
         goto exit;
     }
@@ -1032,20 +1032,20 @@
 "A helper function for ismount on Win32.");
 
 #define OS__GETVOLUMEPATHNAME_METHODDEF    \
-    {"_getvolumepathname", (PyCFunction)os__getvolumepathname, METH_VARARGS|METH_KEYWORDS, os__getvolumepathname__doc__},
+    {"_getvolumepathname", (PyCFunction)os__getvolumepathname, METH_FASTCALL, os__getvolumepathname__doc__},
 
 static PyObject *
 os__getvolumepathname_impl(PyObject *module, PyObject *path);
 
 static PyObject *
-os__getvolumepathname(PyObject *module, PyObject *args, PyObject *kwargs)
+os__getvolumepathname(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"path", NULL};
     static _PyArg_Parser _parser = {"U:_getvolumepathname", _keywords, 0};
     PyObject *path;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &path)) {
         goto exit;
     }
@@ -1071,13 +1071,13 @@
 "The mode argument is ignored on Windows.");
 
 #define OS_MKDIR_METHODDEF    \
-    {"mkdir", (PyCFunction)os_mkdir, METH_VARARGS|METH_KEYWORDS, os_mkdir__doc__},
+    {"mkdir", (PyCFunction)os_mkdir, METH_FASTCALL, os_mkdir__doc__},
 
 static PyObject *
 os_mkdir_impl(PyObject *module, path_t *path, int mode, int dir_fd);
 
 static PyObject *
-os_mkdir(PyObject *module, PyObject *args, PyObject *kwargs)
+os_mkdir(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"path", "mode", "dir_fd", NULL};
@@ -1086,7 +1086,7 @@
     int mode = 511;
     int dir_fd = DEFAULT_DIR_FD;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         path_converter, &path, &mode, MKDIRAT_DIR_FD_CONVERTER, &dir_fd)) {
         goto exit;
     }
@@ -1139,13 +1139,13 @@
 "Return program scheduling priority.");
 
 #define OS_GETPRIORITY_METHODDEF    \
-    {"getpriority", (PyCFunction)os_getpriority, METH_VARARGS|METH_KEYWORDS, os_getpriority__doc__},
+    {"getpriority", (PyCFunction)os_getpriority, METH_FASTCALL, os_getpriority__doc__},
 
 static PyObject *
 os_getpriority_impl(PyObject *module, int which, int who);
 
 static PyObject *
-os_getpriority(PyObject *module, PyObject *args, PyObject *kwargs)
+os_getpriority(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"which", "who", NULL};
@@ -1153,7 +1153,7 @@
     int which;
     int who;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &which, &who)) {
         goto exit;
     }
@@ -1174,13 +1174,13 @@
 "Set program scheduling priority.");
 
 #define OS_SETPRIORITY_METHODDEF    \
-    {"setpriority", (PyCFunction)os_setpriority, METH_VARARGS|METH_KEYWORDS, os_setpriority__doc__},
+    {"setpriority", (PyCFunction)os_setpriority, METH_FASTCALL, os_setpriority__doc__},
 
 static PyObject *
 os_setpriority_impl(PyObject *module, int which, int who, int priority);
 
 static PyObject *
-os_setpriority(PyObject *module, PyObject *args, PyObject *kwargs)
+os_setpriority(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"which", "who", "priority", NULL};
@@ -1189,7 +1189,7 @@
     int who;
     int priority;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &which, &who, &priority)) {
         goto exit;
     }
@@ -1214,14 +1214,14 @@
 "  If they are unavailable, using them will raise a NotImplementedError.");
 
 #define OS_RENAME_METHODDEF    \
-    {"rename", (PyCFunction)os_rename, METH_VARARGS|METH_KEYWORDS, os_rename__doc__},
+    {"rename", (PyCFunction)os_rename, METH_FASTCALL, os_rename__doc__},
 
 static PyObject *
 os_rename_impl(PyObject *module, path_t *src, path_t *dst, int src_dir_fd,
                int dst_dir_fd);
 
 static PyObject *
-os_rename(PyObject *module, PyObject *args, PyObject *kwargs)
+os_rename(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"src", "dst", "src_dir_fd", "dst_dir_fd", NULL};
@@ -1231,7 +1231,7 @@
     int src_dir_fd = DEFAULT_DIR_FD;
     int dst_dir_fd = DEFAULT_DIR_FD;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         path_converter, &src, path_converter, &dst, dir_fd_converter, &src_dir_fd, dir_fd_converter, &dst_dir_fd)) {
         goto exit;
     }
@@ -1259,14 +1259,14 @@
 "  If they are unavailable, using them will raise a NotImplementedError.\"");
 
 #define OS_REPLACE_METHODDEF    \
-    {"replace", (PyCFunction)os_replace, METH_VARARGS|METH_KEYWORDS, os_replace__doc__},
+    {"replace", (PyCFunction)os_replace, METH_FASTCALL, os_replace__doc__},
 
 static PyObject *
 os_replace_impl(PyObject *module, path_t *src, path_t *dst, int src_dir_fd,
                 int dst_dir_fd);
 
 static PyObject *
-os_replace(PyObject *module, PyObject *args, PyObject *kwargs)
+os_replace(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"src", "dst", "src_dir_fd", "dst_dir_fd", NULL};
@@ -1276,7 +1276,7 @@
     int src_dir_fd = DEFAULT_DIR_FD;
     int dst_dir_fd = DEFAULT_DIR_FD;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         path_converter, &src, path_converter, &dst, dir_fd_converter, &src_dir_fd, dir_fd_converter, &dst_dir_fd)) {
         goto exit;
     }
@@ -1303,13 +1303,13 @@
 "  If it is unavailable, using it will raise a NotImplementedError.");
 
 #define OS_RMDIR_METHODDEF    \
-    {"rmdir", (PyCFunction)os_rmdir, METH_VARARGS|METH_KEYWORDS, os_rmdir__doc__},
+    {"rmdir", (PyCFunction)os_rmdir, METH_FASTCALL, os_rmdir__doc__},
 
 static PyObject *
 os_rmdir_impl(PyObject *module, path_t *path, int dir_fd);
 
 static PyObject *
-os_rmdir(PyObject *module, PyObject *args, PyObject *kwargs)
+os_rmdir(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"path", "dir_fd", NULL};
@@ -1317,7 +1317,7 @@
     path_t path = PATH_T_INITIALIZE("rmdir", "path", 0, 0);
     int dir_fd = DEFAULT_DIR_FD;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         path_converter, &path, UNLINKAT_DIR_FD_CONVERTER, &dir_fd)) {
         goto exit;
     }
@@ -1339,13 +1339,13 @@
 "Execute the command in a subshell.");
 
 #define OS_SYSTEM_METHODDEF    \
-    {"system", (PyCFunction)os_system, METH_VARARGS|METH_KEYWORDS, os_system__doc__},
+    {"system", (PyCFunction)os_system, METH_FASTCALL, os_system__doc__},
 
 static long
 os_system_impl(PyObject *module, Py_UNICODE *command);
 
 static PyObject *
-os_system(PyObject *module, PyObject *args, PyObject *kwargs)
+os_system(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"command", NULL};
@@ -1353,7 +1353,7 @@
     Py_UNICODE *command;
     long _return_value;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &command)) {
         goto exit;
     }
@@ -1378,13 +1378,13 @@
 "Execute the command in a subshell.");
 
 #define OS_SYSTEM_METHODDEF    \
-    {"system", (PyCFunction)os_system, METH_VARARGS|METH_KEYWORDS, os_system__doc__},
+    {"system", (PyCFunction)os_system, METH_FASTCALL, os_system__doc__},
 
 static long
 os_system_impl(PyObject *module, PyObject *command);
 
 static PyObject *
-os_system(PyObject *module, PyObject *args, PyObject *kwargs)
+os_system(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"command", NULL};
@@ -1392,7 +1392,7 @@
     PyObject *command = NULL;
     long _return_value;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         PyUnicode_FSConverter, &command)) {
         goto exit;
     }
@@ -1450,13 +1450,13 @@
 "  If it is unavailable, using it will raise a NotImplementedError.");
 
 #define OS_UNLINK_METHODDEF    \
-    {"unlink", (PyCFunction)os_unlink, METH_VARARGS|METH_KEYWORDS, os_unlink__doc__},
+    {"unlink", (PyCFunction)os_unlink, METH_FASTCALL, os_unlink__doc__},
 
 static PyObject *
 os_unlink_impl(PyObject *module, path_t *path, int dir_fd);
 
 static PyObject *
-os_unlink(PyObject *module, PyObject *args, PyObject *kwargs)
+os_unlink(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"path", "dir_fd", NULL};
@@ -1464,7 +1464,7 @@
     path_t path = PATH_T_INITIALIZE("unlink", "path", 0, 0);
     int dir_fd = DEFAULT_DIR_FD;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         path_converter, &path, UNLINKAT_DIR_FD_CONVERTER, &dir_fd)) {
         goto exit;
     }
@@ -1489,13 +1489,13 @@
 "  If it is unavailable, using it will raise a NotImplementedError.");
 
 #define OS_REMOVE_METHODDEF    \
-    {"remove", (PyCFunction)os_remove, METH_VARARGS|METH_KEYWORDS, os_remove__doc__},
+    {"remove", (PyCFunction)os_remove, METH_FASTCALL, os_remove__doc__},
 
 static PyObject *
 os_remove_impl(PyObject *module, path_t *path, int dir_fd);
 
 static PyObject *
-os_remove(PyObject *module, PyObject *args, PyObject *kwargs)
+os_remove(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"path", "dir_fd", NULL};
@@ -1503,7 +1503,7 @@
     path_t path = PATH_T_INITIALIZE("remove", "path", 0, 0);
     int dir_fd = DEFAULT_DIR_FD;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         path_converter, &path, UNLINKAT_DIR_FD_CONVERTER, &dir_fd)) {
         goto exit;
     }
@@ -1571,14 +1571,14 @@
 "  If they are unavailable, using them will raise a NotImplementedError.");
 
 #define OS_UTIME_METHODDEF    \
-    {"utime", (PyCFunction)os_utime, METH_VARARGS|METH_KEYWORDS, os_utime__doc__},
+    {"utime", (PyCFunction)os_utime, METH_FASTCALL, os_utime__doc__},
 
 static PyObject *
 os_utime_impl(PyObject *module, path_t *path, PyObject *times, PyObject *ns,
               int dir_fd, int follow_symlinks);
 
 static PyObject *
-os_utime(PyObject *module, PyObject *args, PyObject *kwargs)
+os_utime(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"path", "times", "ns", "dir_fd", "follow_symlinks", NULL};
@@ -1589,7 +1589,7 @@
     int dir_fd = DEFAULT_DIR_FD;
     int follow_symlinks = 1;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         path_converter, &path, &times, &ns, FUTIMENSAT_DIR_FD_CONVERTER, &dir_fd, &follow_symlinks)) {
         goto exit;
     }
@@ -1609,20 +1609,20 @@
 "Exit to the system with specified status, without normal exit processing.");
 
 #define OS__EXIT_METHODDEF    \
-    {"_exit", (PyCFunction)os__exit, METH_VARARGS|METH_KEYWORDS, os__exit__doc__},
+    {"_exit", (PyCFunction)os__exit, METH_FASTCALL, os__exit__doc__},
 
 static PyObject *
 os__exit_impl(PyObject *module, int status);
 
 static PyObject *
-os__exit(PyObject *module, PyObject *args, PyObject *kwargs)
+os__exit(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"status", NULL};
     static _PyArg_Parser _parser = {"i:_exit", _keywords, 0};
     int status;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &status)) {
         goto exit;
     }
@@ -1689,13 +1689,13 @@
 "    Dictionary of strings mapping to strings.");
 
 #define OS_EXECVE_METHODDEF    \
-    {"execve", (PyCFunction)os_execve, METH_VARARGS|METH_KEYWORDS, os_execve__doc__},
+    {"execve", (PyCFunction)os_execve, METH_FASTCALL, os_execve__doc__},
 
 static PyObject *
 os_execve_impl(PyObject *module, path_t *path, PyObject *argv, PyObject *env);
 
 static PyObject *
-os_execve(PyObject *module, PyObject *args, PyObject *kwargs)
+os_execve(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"path", "argv", "env", NULL};
@@ -1704,7 +1704,7 @@
     PyObject *argv;
     PyObject *env;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         path_converter, &path, &argv, &env)) {
         goto exit;
     }
@@ -1868,20 +1868,20 @@
 "Get the maximum scheduling priority for policy.");
 
 #define OS_SCHED_GET_PRIORITY_MAX_METHODDEF    \
-    {"sched_get_priority_max", (PyCFunction)os_sched_get_priority_max, METH_VARARGS|METH_KEYWORDS, os_sched_get_priority_max__doc__},
+    {"sched_get_priority_max", (PyCFunction)os_sched_get_priority_max, METH_FASTCALL, os_sched_get_priority_max__doc__},
 
 static PyObject *
 os_sched_get_priority_max_impl(PyObject *module, int policy);
 
 static PyObject *
-os_sched_get_priority_max(PyObject *module, PyObject *args, PyObject *kwargs)
+os_sched_get_priority_max(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"policy", NULL};
     static _PyArg_Parser _parser = {"i:sched_get_priority_max", _keywords, 0};
     int policy;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &policy)) {
         goto exit;
     }
@@ -1902,20 +1902,20 @@
 "Get the minimum scheduling priority for policy.");
 
 #define OS_SCHED_GET_PRIORITY_MIN_METHODDEF    \
-    {"sched_get_priority_min", (PyCFunction)os_sched_get_priority_min, METH_VARARGS|METH_KEYWORDS, os_sched_get_priority_min__doc__},
+    {"sched_get_priority_min", (PyCFunction)os_sched_get_priority_min, METH_FASTCALL, os_sched_get_priority_min__doc__},
 
 static PyObject *
 os_sched_get_priority_min_impl(PyObject *module, int policy);
 
 static PyObject *
-os_sched_get_priority_min(PyObject *module, PyObject *args, PyObject *kwargs)
+os_sched_get_priority_min(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"policy", NULL};
     static _PyArg_Parser _parser = {"i:sched_get_priority_min", _keywords, 0};
     int policy;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &policy)) {
         goto exit;
     }
@@ -2398,20 +2398,20 @@
 "Call the system call getpgid(), and return the result.");
 
 #define OS_GETPGID_METHODDEF    \
-    {"getpgid", (PyCFunction)os_getpgid, METH_VARARGS|METH_KEYWORDS, os_getpgid__doc__},
+    {"getpgid", (PyCFunction)os_getpgid, METH_FASTCALL, os_getpgid__doc__},
 
 static PyObject *
 os_getpgid_impl(PyObject *module, pid_t pid);
 
 static PyObject *
-os_getpgid(PyObject *module, PyObject *args, PyObject *kwargs)
+os_getpgid(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"pid", NULL};
     static _PyArg_Parser _parser = {"" _Py_PARSE_PID ":getpgid", _keywords, 0};
     pid_t pid;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &pid)) {
         goto exit;
     }
@@ -2848,20 +2848,20 @@
 "  (pid, status, rusage)");
 
 #define OS_WAIT3_METHODDEF    \
-    {"wait3", (PyCFunction)os_wait3, METH_VARARGS|METH_KEYWORDS, os_wait3__doc__},
+    {"wait3", (PyCFunction)os_wait3, METH_FASTCALL, os_wait3__doc__},
 
 static PyObject *
 os_wait3_impl(PyObject *module, int options);
 
 static PyObject *
-os_wait3(PyObject *module, PyObject *args, PyObject *kwargs)
+os_wait3(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"options", NULL};
     static _PyArg_Parser _parser = {"i:wait3", _keywords, 0};
     int options;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &options)) {
         goto exit;
     }
@@ -2885,13 +2885,13 @@
 "  (pid, status, rusage)");
 
 #define OS_WAIT4_METHODDEF    \
-    {"wait4", (PyCFunction)os_wait4, METH_VARARGS|METH_KEYWORDS, os_wait4__doc__},
+    {"wait4", (PyCFunction)os_wait4, METH_FASTCALL, os_wait4__doc__},
 
 static PyObject *
 os_wait4_impl(PyObject *module, pid_t pid, int options);
 
 static PyObject *
-os_wait4(PyObject *module, PyObject *args, PyObject *kwargs)
+os_wait4(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"pid", "options", NULL};
@@ -2899,7 +2899,7 @@
     pid_t pid;
     int options;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &pid, &options)) {
         goto exit;
     }
@@ -3076,14 +3076,14 @@
 "  If it is unavailable, using it will raise a NotImplementedError.");
 
 #define OS_SYMLINK_METHODDEF    \
-    {"symlink", (PyCFunction)os_symlink, METH_VARARGS|METH_KEYWORDS, os_symlink__doc__},
+    {"symlink", (PyCFunction)os_symlink, METH_FASTCALL, os_symlink__doc__},
 
 static PyObject *
 os_symlink_impl(PyObject *module, path_t *src, path_t *dst,
                 int target_is_directory, int dir_fd);
 
 static PyObject *
-os_symlink(PyObject *module, PyObject *args, PyObject *kwargs)
+os_symlink(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"src", "dst", "target_is_directory", "dir_fd", NULL};
@@ -3093,7 +3093,7 @@
     int target_is_directory = 0;
     int dir_fd = DEFAULT_DIR_FD;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         path_converter, &src, path_converter, &dst, &target_is_directory, SYMLINKAT_DIR_FD_CONVERTER, &dir_fd)) {
         goto exit;
     }
@@ -3298,13 +3298,13 @@
 "  If it is unavailable, using it will raise a NotImplementedError.");
 
 #define OS_OPEN_METHODDEF    \
-    {"open", (PyCFunction)os_open, METH_VARARGS|METH_KEYWORDS, os_open__doc__},
+    {"open", (PyCFunction)os_open, METH_FASTCALL, os_open__doc__},
 
 static int
 os_open_impl(PyObject *module, path_t *path, int flags, int mode, int dir_fd);
 
 static PyObject *
-os_open(PyObject *module, PyObject *args, PyObject *kwargs)
+os_open(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"path", "flags", "mode", "dir_fd", NULL};
@@ -3315,7 +3315,7 @@
     int dir_fd = DEFAULT_DIR_FD;
     int _return_value;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         path_converter, &path, &flags, &mode, OPENAT_DIR_FD_CONVERTER, &dir_fd)) {
         goto exit;
     }
@@ -3339,20 +3339,20 @@
 "Close a file descriptor.");
 
 #define OS_CLOSE_METHODDEF    \
-    {"close", (PyCFunction)os_close, METH_VARARGS|METH_KEYWORDS, os_close__doc__},
+    {"close", (PyCFunction)os_close, METH_FASTCALL, os_close__doc__},
 
 static PyObject *
 os_close_impl(PyObject *module, int fd);
 
 static PyObject *
-os_close(PyObject *module, PyObject *args, PyObject *kwargs)
+os_close(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"fd", NULL};
     static _PyArg_Parser _parser = {"i:close", _keywords, 0};
     int fd;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &fd)) {
         goto exit;
     }
@@ -3430,13 +3430,13 @@
 "Duplicate file descriptor.");
 
 #define OS_DUP2_METHODDEF    \
-    {"dup2", (PyCFunction)os_dup2, METH_VARARGS|METH_KEYWORDS, os_dup2__doc__},
+    {"dup2", (PyCFunction)os_dup2, METH_FASTCALL, os_dup2__doc__},
 
 static PyObject *
 os_dup2_impl(PyObject *module, int fd, int fd2, int inheritable);
 
 static PyObject *
-os_dup2(PyObject *module, PyObject *args, PyObject *kwargs)
+os_dup2(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"fd", "fd2", "inheritable", NULL};
@@ -3445,7 +3445,7 @@
     int fd2;
     int inheritable = 1;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &fd, &fd2, &inheritable)) {
         goto exit;
     }
@@ -3695,20 +3695,20 @@
 "Equivalent to os.stat(fd).");
 
 #define OS_FSTAT_METHODDEF    \
-    {"fstat", (PyCFunction)os_fstat, METH_VARARGS|METH_KEYWORDS, os_fstat__doc__},
+    {"fstat", (PyCFunction)os_fstat, METH_FASTCALL, os_fstat__doc__},
 
 static PyObject *
 os_fstat_impl(PyObject *module, int fd);
 
 static PyObject *
-os_fstat(PyObject *module, PyObject *args, PyObject *kwargs)
+os_fstat(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"fd", NULL};
     static _PyArg_Parser _parser = {"i:fstat", _keywords, 0};
     int fd;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &fd)) {
         goto exit;
     }
@@ -3918,13 +3918,13 @@
 "  If it is unavailable, using it will raise a NotImplementedError.");
 
 #define OS_MKFIFO_METHODDEF    \
-    {"mkfifo", (PyCFunction)os_mkfifo, METH_VARARGS|METH_KEYWORDS, os_mkfifo__doc__},
+    {"mkfifo", (PyCFunction)os_mkfifo, METH_FASTCALL, os_mkfifo__doc__},
 
 static PyObject *
 os_mkfifo_impl(PyObject *module, path_t *path, int mode, int dir_fd);
 
 static PyObject *
-os_mkfifo(PyObject *module, PyObject *args, PyObject *kwargs)
+os_mkfifo(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"path", "mode", "dir_fd", NULL};
@@ -3933,7 +3933,7 @@
     int mode = 438;
     int dir_fd = DEFAULT_DIR_FD;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         path_converter, &path, &mode, MKFIFOAT_DIR_FD_CONVERTER, &dir_fd)) {
         goto exit;
     }
@@ -3969,14 +3969,14 @@
 "  If it is unavailable, using it will raise a NotImplementedError.");
 
 #define OS_MKNOD_METHODDEF    \
-    {"mknod", (PyCFunction)os_mknod, METH_VARARGS|METH_KEYWORDS, os_mknod__doc__},
+    {"mknod", (PyCFunction)os_mknod, METH_FASTCALL, os_mknod__doc__},
 
 static PyObject *
 os_mknod_impl(PyObject *module, path_t *path, int mode, dev_t device,
               int dir_fd);
 
 static PyObject *
-os_mknod(PyObject *module, PyObject *args, PyObject *kwargs)
+os_mknod(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"path", "mode", "device", "dir_fd", NULL};
@@ -3986,7 +3986,7 @@
     dev_t device = 0;
     int dir_fd = DEFAULT_DIR_FD;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         path_converter, &path, &mode, _Py_Dev_Converter, &device, MKNODAT_DIR_FD_CONVERTER, &dir_fd)) {
         goto exit;
     }
@@ -4156,13 +4156,13 @@
 "  If this functionality is unavailable, using it raises an exception.");
 
 #define OS_TRUNCATE_METHODDEF    \
-    {"truncate", (PyCFunction)os_truncate, METH_VARARGS|METH_KEYWORDS, os_truncate__doc__},
+    {"truncate", (PyCFunction)os_truncate, METH_FASTCALL, os_truncate__doc__},
 
 static PyObject *
 os_truncate_impl(PyObject *module, path_t *path, Py_off_t length);
 
 static PyObject *
-os_truncate(PyObject *module, PyObject *args, PyObject *kwargs)
+os_truncate(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"path", "length", NULL};
@@ -4170,7 +4170,7 @@
     path_t path = PATH_T_INITIALIZE("truncate", "path", 0, PATH_HAVE_FTRUNCATE);
     Py_off_t length;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         path_converter, &path, Py_off_t_converter, &length)) {
         goto exit;
     }
@@ -4447,13 +4447,13 @@
 "job control stop.");
 
 #define OS_WIFCONTINUED_METHODDEF    \
-    {"WIFCONTINUED", (PyCFunction)os_WIFCONTINUED, METH_VARARGS|METH_KEYWORDS, os_WIFCONTINUED__doc__},
+    {"WIFCONTINUED", (PyCFunction)os_WIFCONTINUED, METH_FASTCALL, os_WIFCONTINUED__doc__},
 
 static int
 os_WIFCONTINUED_impl(PyObject *module, int status);
 
 static PyObject *
-os_WIFCONTINUED(PyObject *module, PyObject *args, PyObject *kwargs)
+os_WIFCONTINUED(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"status", NULL};
@@ -4461,7 +4461,7 @@
     int status;
     int _return_value;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &status)) {
         goto exit;
     }
@@ -4486,13 +4486,13 @@
 "Return True if the process returning status was stopped.");
 
 #define OS_WIFSTOPPED_METHODDEF    \
-    {"WIFSTOPPED", (PyCFunction)os_WIFSTOPPED, METH_VARARGS|METH_KEYWORDS, os_WIFSTOPPED__doc__},
+    {"WIFSTOPPED", (PyCFunction)os_WIFSTOPPED, METH_FASTCALL, os_WIFSTOPPED__doc__},
 
 static int
 os_WIFSTOPPED_impl(PyObject *module, int status);
 
 static PyObject *
-os_WIFSTOPPED(PyObject *module, PyObject *args, PyObject *kwargs)
+os_WIFSTOPPED(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"status", NULL};
@@ -4500,7 +4500,7 @@
     int status;
     int _return_value;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &status)) {
         goto exit;
     }
@@ -4525,13 +4525,13 @@
 "Return True if the process returning status was terminated by a signal.");
 
 #define OS_WIFSIGNALED_METHODDEF    \
-    {"WIFSIGNALED", (PyCFunction)os_WIFSIGNALED, METH_VARARGS|METH_KEYWORDS, os_WIFSIGNALED__doc__},
+    {"WIFSIGNALED", (PyCFunction)os_WIFSIGNALED, METH_FASTCALL, os_WIFSIGNALED__doc__},
 
 static int
 os_WIFSIGNALED_impl(PyObject *module, int status);
 
 static PyObject *
-os_WIFSIGNALED(PyObject *module, PyObject *args, PyObject *kwargs)
+os_WIFSIGNALED(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"status", NULL};
@@ -4539,7 +4539,7 @@
     int status;
     int _return_value;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &status)) {
         goto exit;
     }
@@ -4564,13 +4564,13 @@
 "Return True if the process returning status exited via the exit() system call.");
 
 #define OS_WIFEXITED_METHODDEF    \
-    {"WIFEXITED", (PyCFunction)os_WIFEXITED, METH_VARARGS|METH_KEYWORDS, os_WIFEXITED__doc__},
+    {"WIFEXITED", (PyCFunction)os_WIFEXITED, METH_FASTCALL, os_WIFEXITED__doc__},
 
 static int
 os_WIFEXITED_impl(PyObject *module, int status);
 
 static PyObject *
-os_WIFEXITED(PyObject *module, PyObject *args, PyObject *kwargs)
+os_WIFEXITED(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"status", NULL};
@@ -4578,7 +4578,7 @@
     int status;
     int _return_value;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &status)) {
         goto exit;
     }
@@ -4603,13 +4603,13 @@
 "Return the process return code from status.");
 
 #define OS_WEXITSTATUS_METHODDEF    \
-    {"WEXITSTATUS", (PyCFunction)os_WEXITSTATUS, METH_VARARGS|METH_KEYWORDS, os_WEXITSTATUS__doc__},
+    {"WEXITSTATUS", (PyCFunction)os_WEXITSTATUS, METH_FASTCALL, os_WEXITSTATUS__doc__},
 
 static int
 os_WEXITSTATUS_impl(PyObject *module, int status);
 
 static PyObject *
-os_WEXITSTATUS(PyObject *module, PyObject *args, PyObject *kwargs)
+os_WEXITSTATUS(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"status", NULL};
@@ -4617,7 +4617,7 @@
     int status;
     int _return_value;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &status)) {
         goto exit;
     }
@@ -4642,13 +4642,13 @@
 "Return the signal that terminated the process that provided the status value.");
 
 #define OS_WTERMSIG_METHODDEF    \
-    {"WTERMSIG", (PyCFunction)os_WTERMSIG, METH_VARARGS|METH_KEYWORDS, os_WTERMSIG__doc__},
+    {"WTERMSIG", (PyCFunction)os_WTERMSIG, METH_FASTCALL, os_WTERMSIG__doc__},
 
 static int
 os_WTERMSIG_impl(PyObject *module, int status);
 
 static PyObject *
-os_WTERMSIG(PyObject *module, PyObject *args, PyObject *kwargs)
+os_WTERMSIG(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"status", NULL};
@@ -4656,7 +4656,7 @@
     int status;
     int _return_value;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &status)) {
         goto exit;
     }
@@ -4681,13 +4681,13 @@
 "Return the signal that stopped the process that provided the status value.");
 
 #define OS_WSTOPSIG_METHODDEF    \
-    {"WSTOPSIG", (PyCFunction)os_WSTOPSIG, METH_VARARGS|METH_KEYWORDS, os_WSTOPSIG__doc__},
+    {"WSTOPSIG", (PyCFunction)os_WSTOPSIG, METH_FASTCALL, os_WSTOPSIG__doc__},
 
 static int
 os_WSTOPSIG_impl(PyObject *module, int status);
 
 static PyObject *
-os_WSTOPSIG(PyObject *module, PyObject *args, PyObject *kwargs)
+os_WSTOPSIG(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"status", NULL};
@@ -4695,7 +4695,7 @@
     int status;
     int _return_value;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &status)) {
         goto exit;
     }
@@ -4757,20 +4757,20 @@
 "  If this functionality is unavailable, using it raises an exception.");
 
 #define OS_STATVFS_METHODDEF    \
-    {"statvfs", (PyCFunction)os_statvfs, METH_VARARGS|METH_KEYWORDS, os_statvfs__doc__},
+    {"statvfs", (PyCFunction)os_statvfs, METH_FASTCALL, os_statvfs__doc__},
 
 static PyObject *
 os_statvfs_impl(PyObject *module, path_t *path);
 
 static PyObject *
-os_statvfs(PyObject *module, PyObject *args, PyObject *kwargs)
+os_statvfs(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"path", NULL};
     static _PyArg_Parser _parser = {"O&:statvfs", _keywords, 0};
     path_t path = PATH_T_INITIALIZE("statvfs", "path", 0, PATH_HAVE_FSTATVFS);
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         path_converter, &path)) {
         goto exit;
     }
@@ -4794,20 +4794,20 @@
 "Return disk usage statistics about the given path as a (total, free) tuple.");
 
 #define OS__GETDISKUSAGE_METHODDEF    \
-    {"_getdiskusage", (PyCFunction)os__getdiskusage, METH_VARARGS|METH_KEYWORDS, os__getdiskusage__doc__},
+    {"_getdiskusage", (PyCFunction)os__getdiskusage, METH_FASTCALL, os__getdiskusage__doc__},
 
 static PyObject *
 os__getdiskusage_impl(PyObject *module, Py_UNICODE *path);
 
 static PyObject *
-os__getdiskusage(PyObject *module, PyObject *args, PyObject *kwargs)
+os__getdiskusage(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"path", NULL};
     static _PyArg_Parser _parser = {"u:_getdiskusage", _keywords, 0};
     Py_UNICODE *path;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &path)) {
         goto exit;
     }
@@ -4872,13 +4872,13 @@
 "  If this functionality is unavailable, using it raises an exception.");
 
 #define OS_PATHCONF_METHODDEF    \
-    {"pathconf", (PyCFunction)os_pathconf, METH_VARARGS|METH_KEYWORDS, os_pathconf__doc__},
+    {"pathconf", (PyCFunction)os_pathconf, METH_FASTCALL, os_pathconf__doc__},
 
 static long
 os_pathconf_impl(PyObject *module, path_t *path, int name);
 
 static PyObject *
-os_pathconf(PyObject *module, PyObject *args, PyObject *kwargs)
+os_pathconf(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"path", "name", NULL};
@@ -4887,7 +4887,7 @@
     int name;
     long _return_value;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         path_converter, &path, conv_path_confname, &name)) {
         goto exit;
     }
@@ -5020,20 +5020,21 @@
 "the underlying Win32 ShellExecute function doesn\'t work if it is.");
 
 #define OS_STARTFILE_METHODDEF    \
-    {"startfile", (PyCFunction)os_startfile, METH_VARARGS|METH_KEYWORDS, os_startfile__doc__},
+    {"startfile", (PyCFunction)os_startfile, METH_FASTCALL, os_startfile__doc__},
 
 static PyObject *
 os_startfile_impl(PyObject *module, path_t *filepath, Py_UNICODE *operation);
 
 static PyObject *
-os_startfile(PyObject *module, PyObject *args, PyObject *kwargs)
+os_startfile(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    static char *_keywords[] = {"filepath", "operation", NULL};
+    static const char * const _keywords[] = {"filepath", "operation", NULL};
+    static _PyArg_Parser _parser = {"O&|u:startfile", _keywords, 0};
     path_t filepath = PATH_T_INITIALIZE("startfile", "filepath", 0, 0);
     Py_UNICODE *operation = NULL;
 
-    if (!PyArg_ParseTupleAndKeywords(args, kwargs, "O&|u:startfile", _keywords,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         path_converter, &filepath, &operation)) {
         goto exit;
     }
@@ -5084,20 +5085,20 @@
 "If the device is not a terminal, return None.");
 
 #define OS_DEVICE_ENCODING_METHODDEF    \
-    {"device_encoding", (PyCFunction)os_device_encoding, METH_VARARGS|METH_KEYWORDS, os_device_encoding__doc__},
+    {"device_encoding", (PyCFunction)os_device_encoding, METH_FASTCALL, os_device_encoding__doc__},
 
 static PyObject *
 os_device_encoding_impl(PyObject *module, int fd);
 
 static PyObject *
-os_device_encoding(PyObject *module, PyObject *args, PyObject *kwargs)
+os_device_encoding(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"fd", NULL};
     static _PyArg_Parser _parser = {"i:device_encoding", _keywords, 0};
     int fd;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &fd)) {
         goto exit;
     }
@@ -5233,14 +5234,14 @@
 "  the link points to.");
 
 #define OS_GETXATTR_METHODDEF    \
-    {"getxattr", (PyCFunction)os_getxattr, METH_VARARGS|METH_KEYWORDS, os_getxattr__doc__},
+    {"getxattr", (PyCFunction)os_getxattr, METH_FASTCALL, os_getxattr__doc__},
 
 static PyObject *
 os_getxattr_impl(PyObject *module, path_t *path, path_t *attribute,
                  int follow_symlinks);
 
 static PyObject *
-os_getxattr(PyObject *module, PyObject *args, PyObject *kwargs)
+os_getxattr(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"path", "attribute", "follow_symlinks", NULL};
@@ -5249,7 +5250,7 @@
     path_t attribute = PATH_T_INITIALIZE("getxattr", "attribute", 0, 0);
     int follow_symlinks = 1;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         path_converter, &path, path_converter, &attribute, &follow_symlinks)) {
         goto exit;
     }
@@ -5281,14 +5282,14 @@
 "  the link points to.");
 
 #define OS_SETXATTR_METHODDEF    \
-    {"setxattr", (PyCFunction)os_setxattr, METH_VARARGS|METH_KEYWORDS, os_setxattr__doc__},
+    {"setxattr", (PyCFunction)os_setxattr, METH_FASTCALL, os_setxattr__doc__},
 
 static PyObject *
 os_setxattr_impl(PyObject *module, path_t *path, path_t *attribute,
                  Py_buffer *value, int flags, int follow_symlinks);
 
 static PyObject *
-os_setxattr(PyObject *module, PyObject *args, PyObject *kwargs)
+os_setxattr(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"path", "attribute", "value", "flags", "follow_symlinks", NULL};
@@ -5299,7 +5300,7 @@
     int flags = 0;
     int follow_symlinks = 1;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         path_converter, &path, path_converter, &attribute, &value, &flags, &follow_symlinks)) {
         goto exit;
     }
@@ -5334,14 +5335,14 @@
 "  the link points to.");
 
 #define OS_REMOVEXATTR_METHODDEF    \
-    {"removexattr", (PyCFunction)os_removexattr, METH_VARARGS|METH_KEYWORDS, os_removexattr__doc__},
+    {"removexattr", (PyCFunction)os_removexattr, METH_FASTCALL, os_removexattr__doc__},
 
 static PyObject *
 os_removexattr_impl(PyObject *module, path_t *path, path_t *attribute,
                     int follow_symlinks);
 
 static PyObject *
-os_removexattr(PyObject *module, PyObject *args, PyObject *kwargs)
+os_removexattr(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"path", "attribute", "follow_symlinks", NULL};
@@ -5350,7 +5351,7 @@
     path_t attribute = PATH_T_INITIALIZE("removexattr", "attribute", 0, 0);
     int follow_symlinks = 1;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         path_converter, &path, path_converter, &attribute, &follow_symlinks)) {
         goto exit;
     }
@@ -5382,13 +5383,13 @@
 "  the link points to.");
 
 #define OS_LISTXATTR_METHODDEF    \
-    {"listxattr", (PyCFunction)os_listxattr, METH_VARARGS|METH_KEYWORDS, os_listxattr__doc__},
+    {"listxattr", (PyCFunction)os_listxattr, METH_FASTCALL, os_listxattr__doc__},
 
 static PyObject *
 os_listxattr_impl(PyObject *module, path_t *path, int follow_symlinks);
 
 static PyObject *
-os_listxattr(PyObject *module, PyObject *args, PyObject *kwargs)
+os_listxattr(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"path", "follow_symlinks", NULL};
@@ -5396,7 +5397,7 @@
     path_t path = PATH_T_INITIALIZE("listxattr", "path", 1, 1);
     int follow_symlinks = 1;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         path_converter, &path, &follow_symlinks)) {
         goto exit;
     }
@@ -5602,20 +5603,20 @@
 "types raise a TypeError.");
 
 #define OS_FSPATH_METHODDEF    \
-    {"fspath", (PyCFunction)os_fspath, METH_VARARGS|METH_KEYWORDS, os_fspath__doc__},
+    {"fspath", (PyCFunction)os_fspath, METH_FASTCALL, os_fspath__doc__},
 
 static PyObject *
 os_fspath_impl(PyObject *module, PyObject *path);
 
 static PyObject *
-os_fspath(PyObject *module, PyObject *args, PyObject *kwargs)
+os_fspath(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"path", NULL};
     static _PyArg_Parser _parser = {"O:fspath", _keywords, 0};
     PyObject *path;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &path)) {
         goto exit;
     }
@@ -5634,13 +5635,13 @@
 "Obtain a series of random bytes.");
 
 #define OS_GETRANDOM_METHODDEF    \
-    {"getrandom", (PyCFunction)os_getrandom, METH_VARARGS|METH_KEYWORDS, os_getrandom__doc__},
+    {"getrandom", (PyCFunction)os_getrandom, METH_FASTCALL, os_getrandom__doc__},
 
 static PyObject *
 os_getrandom_impl(PyObject *module, Py_ssize_t size, int flags);
 
 static PyObject *
-os_getrandom(PyObject *module, PyObject *args, PyObject *kwargs)
+os_getrandom(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"size", "flags", NULL};
@@ -5648,7 +5649,7 @@
     Py_ssize_t size;
     int flags = 0;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &size, &flags)) {
         goto exit;
     }
@@ -6139,4 +6140,4 @@
 #ifndef OS_GETRANDOM_METHODDEF
     #define OS_GETRANDOM_METHODDEF
 #endif /* !defined(OS_GETRANDOM_METHODDEF) */
-/*[clinic end generated code: output=fce51c7d432662c2 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=dfa6bc9d1f2db750 input=a9049054013a1b77]*/
diff --git a/Modules/clinic/pyexpat.c.h b/Modules/clinic/pyexpat.c.h
index 8a03f67..75a096c 100644
--- a/Modules/clinic/pyexpat.c.h
+++ b/Modules/clinic/pyexpat.c.h
@@ -233,14 +233,14 @@
 "Return a new XML parser object.");
 
 #define PYEXPAT_PARSERCREATE_METHODDEF    \
-    {"ParserCreate", (PyCFunction)pyexpat_ParserCreate, METH_VARARGS|METH_KEYWORDS, pyexpat_ParserCreate__doc__},
+    {"ParserCreate", (PyCFunction)pyexpat_ParserCreate, METH_FASTCALL, pyexpat_ParserCreate__doc__},
 
 static PyObject *
 pyexpat_ParserCreate_impl(PyObject *module, const char *encoding,
                           const char *namespace_separator, PyObject *intern);
 
 static PyObject *
-pyexpat_ParserCreate(PyObject *module, PyObject *args, PyObject *kwargs)
+pyexpat_ParserCreate(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"encoding", "namespace_separator", "intern", NULL};
@@ -249,7 +249,7 @@
     const char *namespace_separator = NULL;
     PyObject *intern = NULL;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &encoding, &namespace_separator, &intern)) {
         goto exit;
     }
@@ -289,4 +289,4 @@
 #ifndef PYEXPAT_XMLPARSER_USEFOREIGNDTD_METHODDEF
     #define PYEXPAT_XMLPARSER_USEFOREIGNDTD_METHODDEF
 #endif /* !defined(PYEXPAT_XMLPARSER_USEFOREIGNDTD_METHODDEF) */
-/*[clinic end generated code: output=93cfe662f2bc48e5 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=e889f7c6af6cc42f input=a9049054013a1b77]*/
diff --git a/Modules/clinic/sha1module.c.h b/Modules/clinic/sha1module.c.h
index 1972762..b08e92d 100644
--- a/Modules/clinic/sha1module.c.h
+++ b/Modules/clinic/sha1module.c.h
@@ -72,20 +72,20 @@
 "Return a new SHA1 hash object; optionally initialized with a string.");
 
 #define _SHA1_SHA1_METHODDEF    \
-    {"sha1", (PyCFunction)_sha1_sha1, METH_VARARGS|METH_KEYWORDS, _sha1_sha1__doc__},
+    {"sha1", (PyCFunction)_sha1_sha1, METH_FASTCALL, _sha1_sha1__doc__},
 
 static PyObject *
 _sha1_sha1_impl(PyObject *module, PyObject *string);
 
 static PyObject *
-_sha1_sha1(PyObject *module, PyObject *args, PyObject *kwargs)
+_sha1_sha1(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"string", NULL};
     static _PyArg_Parser _parser = {"|O:sha1", _keywords, 0};
     PyObject *string = NULL;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &string)) {
         goto exit;
     }
@@ -94,4 +94,4 @@
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=549a5d08c248337d input=a9049054013a1b77]*/
+/*[clinic end generated code: output=1430450f3f806895 input=a9049054013a1b77]*/
diff --git a/Modules/clinic/sha256module.c.h b/Modules/clinic/sha256module.c.h
index 4239ab8..115db50 100644
--- a/Modules/clinic/sha256module.c.h
+++ b/Modules/clinic/sha256module.c.h
@@ -72,20 +72,20 @@
 "Return a new SHA-256 hash object; optionally initialized with a string.");
 
 #define _SHA256_SHA256_METHODDEF    \
-    {"sha256", (PyCFunction)_sha256_sha256, METH_VARARGS|METH_KEYWORDS, _sha256_sha256__doc__},
+    {"sha256", (PyCFunction)_sha256_sha256, METH_FASTCALL, _sha256_sha256__doc__},
 
 static PyObject *
 _sha256_sha256_impl(PyObject *module, PyObject *string);
 
 static PyObject *
-_sha256_sha256(PyObject *module, PyObject *args, PyObject *kwargs)
+_sha256_sha256(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"string", NULL};
     static _PyArg_Parser _parser = {"|O:sha256", _keywords, 0};
     PyObject *string = NULL;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &string)) {
         goto exit;
     }
@@ -102,20 +102,20 @@
 "Return a new SHA-224 hash object; optionally initialized with a string.");
 
 #define _SHA256_SHA224_METHODDEF    \
-    {"sha224", (PyCFunction)_sha256_sha224, METH_VARARGS|METH_KEYWORDS, _sha256_sha224__doc__},
+    {"sha224", (PyCFunction)_sha256_sha224, METH_FASTCALL, _sha256_sha224__doc__},
 
 static PyObject *
 _sha256_sha224_impl(PyObject *module, PyObject *string);
 
 static PyObject *
-_sha256_sha224(PyObject *module, PyObject *args, PyObject *kwargs)
+_sha256_sha224(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"string", NULL};
     static _PyArg_Parser _parser = {"|O:sha224", _keywords, 0};
     PyObject *string = NULL;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &string)) {
         goto exit;
     }
@@ -124,4 +124,4 @@
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=a1296ba6d0780051 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=19439d70db7ead5c input=a9049054013a1b77]*/
diff --git a/Modules/clinic/sha512module.c.h b/Modules/clinic/sha512module.c.h
index 9680ea2..a2b57f7 100644
--- a/Modules/clinic/sha512module.c.h
+++ b/Modules/clinic/sha512module.c.h
@@ -72,20 +72,20 @@
 "Return a new SHA-512 hash object; optionally initialized with a string.");
 
 #define _SHA512_SHA512_METHODDEF    \
-    {"sha512", (PyCFunction)_sha512_sha512, METH_VARARGS|METH_KEYWORDS, _sha512_sha512__doc__},
+    {"sha512", (PyCFunction)_sha512_sha512, METH_FASTCALL, _sha512_sha512__doc__},
 
 static PyObject *
 _sha512_sha512_impl(PyObject *module, PyObject *string);
 
 static PyObject *
-_sha512_sha512(PyObject *module, PyObject *args, PyObject *kwargs)
+_sha512_sha512(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"string", NULL};
     static _PyArg_Parser _parser = {"|O:sha512", _keywords, 0};
     PyObject *string = NULL;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &string)) {
         goto exit;
     }
@@ -102,20 +102,20 @@
 "Return a new SHA-384 hash object; optionally initialized with a string.");
 
 #define _SHA512_SHA384_METHODDEF    \
-    {"sha384", (PyCFunction)_sha512_sha384, METH_VARARGS|METH_KEYWORDS, _sha512_sha384__doc__},
+    {"sha384", (PyCFunction)_sha512_sha384, METH_FASTCALL, _sha512_sha384__doc__},
 
 static PyObject *
 _sha512_sha384_impl(PyObject *module, PyObject *string);
 
 static PyObject *
-_sha512_sha384(PyObject *module, PyObject *args, PyObject *kwargs)
+_sha512_sha384(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"string", NULL};
     static _PyArg_Parser _parser = {"|O:sha384", _keywords, 0};
     PyObject *string = NULL;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &string)) {
         goto exit;
     }
@@ -124,4 +124,4 @@
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=8f7f6603a9c4e910 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=18f15598c3487045 input=a9049054013a1b77]*/
diff --git a/Modules/clinic/zlibmodule.c.h b/Modules/clinic/zlibmodule.c.h
index 172308a..fda392a 100644
--- a/Modules/clinic/zlibmodule.c.h
+++ b/Modules/clinic/zlibmodule.c.h
@@ -14,13 +14,13 @@
 "    Compression level, in 0-9 or -1.");
 
 #define ZLIB_COMPRESS_METHODDEF    \
-    {"compress", (PyCFunction)zlib_compress, METH_VARARGS|METH_KEYWORDS, zlib_compress__doc__},
+    {"compress", (PyCFunction)zlib_compress, METH_FASTCALL, zlib_compress__doc__},
 
 static PyObject *
 zlib_compress_impl(PyObject *module, Py_buffer *data, int level);
 
 static PyObject *
-zlib_compress(PyObject *module, PyObject *args, PyObject *kwargs)
+zlib_compress(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"", "level", NULL};
@@ -28,7 +28,7 @@
     Py_buffer data = {NULL, NULL};
     int level = Z_DEFAULT_COMPRESSION;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &data, &level)) {
         goto exit;
     }
@@ -57,14 +57,14 @@
 "    The initial output buffer size.");
 
 #define ZLIB_DECOMPRESS_METHODDEF    \
-    {"decompress", (PyCFunction)zlib_decompress, METH_VARARGS|METH_KEYWORDS, zlib_decompress__doc__},
+    {"decompress", (PyCFunction)zlib_decompress, METH_FASTCALL, zlib_decompress__doc__},
 
 static PyObject *
 zlib_decompress_impl(PyObject *module, Py_buffer *data, int wbits,
                      Py_ssize_t bufsize);
 
 static PyObject *
-zlib_decompress(PyObject *module, PyObject *args, PyObject *kwargs)
+zlib_decompress(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"", "wbits", "bufsize", NULL};
@@ -73,7 +73,7 @@
     int wbits = MAX_WBITS;
     Py_ssize_t bufsize = DEF_BUF_SIZE;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &data, &wbits, ssize_t_converter, &bufsize)) {
         goto exit;
     }
@@ -119,14 +119,14 @@
 "    containing subsequences that are likely to occur in the input data.");
 
 #define ZLIB_COMPRESSOBJ_METHODDEF    \
-    {"compressobj", (PyCFunction)zlib_compressobj, METH_VARARGS|METH_KEYWORDS, zlib_compressobj__doc__},
+    {"compressobj", (PyCFunction)zlib_compressobj, METH_FASTCALL, zlib_compressobj__doc__},
 
 static PyObject *
 zlib_compressobj_impl(PyObject *module, int level, int method, int wbits,
                       int memLevel, int strategy, Py_buffer *zdict);
 
 static PyObject *
-zlib_compressobj(PyObject *module, PyObject *args, PyObject *kwargs)
+zlib_compressobj(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"level", "method", "wbits", "memLevel", "strategy", "zdict", NULL};
@@ -138,7 +138,7 @@
     int strategy = Z_DEFAULT_STRATEGY;
     Py_buffer zdict = {NULL, NULL};
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &level, &method, &wbits, &memLevel, &strategy, &zdict)) {
         goto exit;
     }
@@ -166,13 +166,13 @@
 "    dictionary as used by the compressor that produced the input data.");
 
 #define ZLIB_DECOMPRESSOBJ_METHODDEF    \
-    {"decompressobj", (PyCFunction)zlib_decompressobj, METH_VARARGS|METH_KEYWORDS, zlib_decompressobj__doc__},
+    {"decompressobj", (PyCFunction)zlib_decompressobj, METH_FASTCALL, zlib_decompressobj__doc__},
 
 static PyObject *
 zlib_decompressobj_impl(PyObject *module, int wbits, PyObject *zdict);
 
 static PyObject *
-zlib_decompressobj(PyObject *module, PyObject *args, PyObject *kwargs)
+zlib_decompressobj(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"wbits", "zdict", NULL};
@@ -180,7 +180,7 @@
     int wbits = MAX_WBITS;
     PyObject *zdict = NULL;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &wbits, &zdict)) {
         goto exit;
     }
@@ -247,14 +247,14 @@
 "Call the flush() method to clear these buffers.");
 
 #define ZLIB_DECOMPRESS_DECOMPRESS_METHODDEF    \
-    {"decompress", (PyCFunction)zlib_Decompress_decompress, METH_VARARGS|METH_KEYWORDS, zlib_Decompress_decompress__doc__},
+    {"decompress", (PyCFunction)zlib_Decompress_decompress, METH_FASTCALL, zlib_Decompress_decompress__doc__},
 
 static PyObject *
 zlib_Decompress_decompress_impl(compobject *self, Py_buffer *data,
                                 Py_ssize_t max_length);
 
 static PyObject *
-zlib_Decompress_decompress(compobject *self, PyObject *args, PyObject *kwargs)
+zlib_Decompress_decompress(compobject *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"", "max_length", NULL};
@@ -262,7 +262,7 @@
     Py_buffer data = {NULL, NULL};
     Py_ssize_t max_length = 0;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &data, ssize_t_converter, &max_length)) {
         goto exit;
     }
@@ -467,4 +467,4 @@
 #ifndef ZLIB_COMPRESS_COPY_METHODDEF
     #define ZLIB_COMPRESS_COPY_METHODDEF
 #endif /* !defined(ZLIB_COMPRESS_COPY_METHODDEF) */
-/*[clinic end generated code: output=48911ef429b65903 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=3a4e2bfe750423a3 input=a9049054013a1b77]*/
diff --git a/Objects/clinic/bytearrayobject.c.h b/Objects/clinic/bytearrayobject.c.h
index a60be76..c75acb7 100644
--- a/Objects/clinic/bytearrayobject.c.h
+++ b/Objects/clinic/bytearrayobject.c.h
@@ -51,14 +51,14 @@
 "The remaining characters are mapped through the given translation table.");
 
 #define BYTEARRAY_TRANSLATE_METHODDEF    \
-    {"translate", (PyCFunction)bytearray_translate, METH_VARARGS|METH_KEYWORDS, bytearray_translate__doc__},
+    {"translate", (PyCFunction)bytearray_translate, METH_FASTCALL, bytearray_translate__doc__},
 
 static PyObject *
 bytearray_translate_impl(PyByteArrayObject *self, PyObject *table,
                          PyObject *deletechars);
 
 static PyObject *
-bytearray_translate(PyByteArrayObject *self, PyObject *args, PyObject *kwargs)
+bytearray_translate(PyByteArrayObject *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"", "delete", NULL};
@@ -66,7 +66,7 @@
     PyObject *table;
     PyObject *deletechars = NULL;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &table, &deletechars)) {
         goto exit;
     }
@@ -181,14 +181,14 @@
 "    -1 (the default value) means no limit.");
 
 #define BYTEARRAY_SPLIT_METHODDEF    \
-    {"split", (PyCFunction)bytearray_split, METH_VARARGS|METH_KEYWORDS, bytearray_split__doc__},
+    {"split", (PyCFunction)bytearray_split, METH_FASTCALL, bytearray_split__doc__},
 
 static PyObject *
 bytearray_split_impl(PyByteArrayObject *self, PyObject *sep,
                      Py_ssize_t maxsplit);
 
 static PyObject *
-bytearray_split(PyByteArrayObject *self, PyObject *args, PyObject *kwargs)
+bytearray_split(PyByteArrayObject *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"sep", "maxsplit", NULL};
@@ -196,7 +196,7 @@
     PyObject *sep = Py_None;
     Py_ssize_t maxsplit = -1;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &sep, &maxsplit)) {
         goto exit;
     }
@@ -255,14 +255,14 @@
 "Splitting is done starting at the end of the bytearray and working to the front.");
 
 #define BYTEARRAY_RSPLIT_METHODDEF    \
-    {"rsplit", (PyCFunction)bytearray_rsplit, METH_VARARGS|METH_KEYWORDS, bytearray_rsplit__doc__},
+    {"rsplit", (PyCFunction)bytearray_rsplit, METH_FASTCALL, bytearray_rsplit__doc__},
 
 static PyObject *
 bytearray_rsplit_impl(PyByteArrayObject *self, PyObject *sep,
                       Py_ssize_t maxsplit);
 
 static PyObject *
-bytearray_rsplit(PyByteArrayObject *self, PyObject *args, PyObject *kwargs)
+bytearray_rsplit(PyByteArrayObject *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"sep", "maxsplit", NULL};
@@ -270,7 +270,7 @@
     PyObject *sep = Py_None;
     Py_ssize_t maxsplit = -1;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &sep, &maxsplit)) {
         goto exit;
     }
@@ -547,14 +547,14 @@
 "    can handle UnicodeDecodeErrors.");
 
 #define BYTEARRAY_DECODE_METHODDEF    \
-    {"decode", (PyCFunction)bytearray_decode, METH_VARARGS|METH_KEYWORDS, bytearray_decode__doc__},
+    {"decode", (PyCFunction)bytearray_decode, METH_FASTCALL, bytearray_decode__doc__},
 
 static PyObject *
 bytearray_decode_impl(PyByteArrayObject *self, const char *encoding,
                       const char *errors);
 
 static PyObject *
-bytearray_decode(PyByteArrayObject *self, PyObject *args, PyObject *kwargs)
+bytearray_decode(PyByteArrayObject *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"encoding", "errors", NULL};
@@ -562,7 +562,7 @@
     const char *encoding = NULL;
     const char *errors = NULL;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &encoding, &errors)) {
         goto exit;
     }
@@ -595,20 +595,20 @@
 "true.");
 
 #define BYTEARRAY_SPLITLINES_METHODDEF    \
-    {"splitlines", (PyCFunction)bytearray_splitlines, METH_VARARGS|METH_KEYWORDS, bytearray_splitlines__doc__},
+    {"splitlines", (PyCFunction)bytearray_splitlines, METH_FASTCALL, bytearray_splitlines__doc__},
 
 static PyObject *
 bytearray_splitlines_impl(PyByteArrayObject *self, int keepends);
 
 static PyObject *
-bytearray_splitlines(PyByteArrayObject *self, PyObject *args, PyObject *kwargs)
+bytearray_splitlines(PyByteArrayObject *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"keepends", NULL};
     static _PyArg_Parser _parser = {"|i:splitlines", _keywords, 0};
     int keepends = 0;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &keepends)) {
         goto exit;
     }
@@ -711,4 +711,4 @@
 {
     return bytearray_sizeof_impl(self);
 }
-/*[clinic end generated code: output=59a0c86b29ff06d1 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=225342a680391b9c input=a9049054013a1b77]*/
diff --git a/Objects/clinic/bytesobject.c.h b/Objects/clinic/bytesobject.c.h
index f179ce6..a11ebd2 100644
--- a/Objects/clinic/bytesobject.c.h
+++ b/Objects/clinic/bytesobject.c.h
@@ -17,13 +17,13 @@
 "    -1 (the default value) means no limit.");
 
 #define BYTES_SPLIT_METHODDEF    \
-    {"split", (PyCFunction)bytes_split, METH_VARARGS|METH_KEYWORDS, bytes_split__doc__},
+    {"split", (PyCFunction)bytes_split, METH_FASTCALL, bytes_split__doc__},
 
 static PyObject *
 bytes_split_impl(PyBytesObject *self, PyObject *sep, Py_ssize_t maxsplit);
 
 static PyObject *
-bytes_split(PyBytesObject *self, PyObject *args, PyObject *kwargs)
+bytes_split(PyBytesObject *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"sep", "maxsplit", NULL};
@@ -31,7 +31,7 @@
     PyObject *sep = Py_None;
     Py_ssize_t maxsplit = -1;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &sep, &maxsplit)) {
         goto exit;
     }
@@ -136,13 +136,13 @@
 "Splitting is done starting at the end of the bytes and working to the front.");
 
 #define BYTES_RSPLIT_METHODDEF    \
-    {"rsplit", (PyCFunction)bytes_rsplit, METH_VARARGS|METH_KEYWORDS, bytes_rsplit__doc__},
+    {"rsplit", (PyCFunction)bytes_rsplit, METH_FASTCALL, bytes_rsplit__doc__},
 
 static PyObject *
 bytes_rsplit_impl(PyBytesObject *self, PyObject *sep, Py_ssize_t maxsplit);
 
 static PyObject *
-bytes_rsplit(PyBytesObject *self, PyObject *args, PyObject *kwargs)
+bytes_rsplit(PyBytesObject *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"sep", "maxsplit", NULL};
@@ -150,7 +150,7 @@
     PyObject *sep = Py_None;
     Py_ssize_t maxsplit = -1;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &sep, &maxsplit)) {
         goto exit;
     }
@@ -281,14 +281,14 @@
 "The remaining characters are mapped through the given translation table.");
 
 #define BYTES_TRANSLATE_METHODDEF    \
-    {"translate", (PyCFunction)bytes_translate, METH_VARARGS|METH_KEYWORDS, bytes_translate__doc__},
+    {"translate", (PyCFunction)bytes_translate, METH_FASTCALL, bytes_translate__doc__},
 
 static PyObject *
 bytes_translate_impl(PyBytesObject *self, PyObject *table,
                      PyObject *deletechars);
 
 static PyObject *
-bytes_translate(PyBytesObject *self, PyObject *args, PyObject *kwargs)
+bytes_translate(PyBytesObject *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"", "delete", NULL};
@@ -296,7 +296,7 @@
     PyObject *table;
     PyObject *deletechars = NULL;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &table, &deletechars)) {
         goto exit;
     }
@@ -412,14 +412,14 @@
 "    can handle UnicodeDecodeErrors.");
 
 #define BYTES_DECODE_METHODDEF    \
-    {"decode", (PyCFunction)bytes_decode, METH_VARARGS|METH_KEYWORDS, bytes_decode__doc__},
+    {"decode", (PyCFunction)bytes_decode, METH_FASTCALL, bytes_decode__doc__},
 
 static PyObject *
 bytes_decode_impl(PyBytesObject *self, const char *encoding,
                   const char *errors);
 
 static PyObject *
-bytes_decode(PyBytesObject *self, PyObject *args, PyObject *kwargs)
+bytes_decode(PyBytesObject *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"encoding", "errors", NULL};
@@ -427,7 +427,7 @@
     const char *encoding = NULL;
     const char *errors = NULL;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &encoding, &errors)) {
         goto exit;
     }
@@ -447,20 +447,20 @@
 "true.");
 
 #define BYTES_SPLITLINES_METHODDEF    \
-    {"splitlines", (PyCFunction)bytes_splitlines, METH_VARARGS|METH_KEYWORDS, bytes_splitlines__doc__},
+    {"splitlines", (PyCFunction)bytes_splitlines, METH_FASTCALL, bytes_splitlines__doc__},
 
 static PyObject *
 bytes_splitlines_impl(PyBytesObject *self, int keepends);
 
 static PyObject *
-bytes_splitlines(PyBytesObject *self, PyObject *args, PyObject *kwargs)
+bytes_splitlines(PyBytesObject *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"keepends", NULL};
     static _PyArg_Parser _parser = {"|i:splitlines", _keywords, 0};
     int keepends = 0;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &keepends)) {
         goto exit;
     }
@@ -499,4 +499,4 @@
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=5618c05c24c1e617 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=2dc3c93cfd2dc440 input=a9049054013a1b77]*/
diff --git a/PC/clinic/winreg.c.h b/PC/clinic/winreg.c.h
index e7836e4..c7d5b9e 100644
--- a/PC/clinic/winreg.c.h
+++ b/PC/clinic/winreg.c.h
@@ -77,14 +77,14 @@
 "\n");
 
 #define WINREG_HKEYTYPE___EXIT___METHODDEF    \
-    {"__exit__", (PyCFunction)winreg_HKEYType___exit__, METH_VARARGS|METH_KEYWORDS, winreg_HKEYType___exit____doc__},
+    {"__exit__", (PyCFunction)winreg_HKEYType___exit__, METH_FASTCALL, winreg_HKEYType___exit____doc__},
 
 static PyObject *
 winreg_HKEYType___exit___impl(PyHKEYObject *self, PyObject *exc_type,
                               PyObject *exc_value, PyObject *traceback);
 
 static PyObject *
-winreg_HKEYType___exit__(PyHKEYObject *self, PyObject *args, PyObject *kwargs)
+winreg_HKEYType___exit__(PyHKEYObject *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"exc_type", "exc_value", "traceback", NULL};
@@ -93,7 +93,7 @@
     PyObject *exc_value;
     PyObject *traceback;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &exc_type, &exc_value, &traceback)) {
         goto exit;
     }
@@ -235,14 +235,14 @@
 "If the function fails, an OSError exception is raised.");
 
 #define WINREG_CREATEKEYEX_METHODDEF    \
-    {"CreateKeyEx", (PyCFunction)winreg_CreateKeyEx, METH_VARARGS|METH_KEYWORDS, winreg_CreateKeyEx__doc__},
+    {"CreateKeyEx", (PyCFunction)winreg_CreateKeyEx, METH_FASTCALL, winreg_CreateKeyEx__doc__},
 
 static HKEY
 winreg_CreateKeyEx_impl(PyObject *module, HKEY key, Py_UNICODE *sub_key,
                         int reserved, REGSAM access);
 
 static PyObject *
-winreg_CreateKeyEx(PyObject *module, PyObject *args, PyObject *kwargs)
+winreg_CreateKeyEx(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"key", "sub_key", "reserved", "access", NULL};
@@ -253,7 +253,7 @@
     REGSAM access = KEY_WRITE;
     HKEY _return_value;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         clinic_HKEY_converter, &key, &sub_key, &reserved, &access)) {
         goto exit;
     }
@@ -334,14 +334,14 @@
 "On unsupported Windows versions, NotImplementedError is raised.");
 
 #define WINREG_DELETEKEYEX_METHODDEF    \
-    {"DeleteKeyEx", (PyCFunction)winreg_DeleteKeyEx, METH_VARARGS|METH_KEYWORDS, winreg_DeleteKeyEx__doc__},
+    {"DeleteKeyEx", (PyCFunction)winreg_DeleteKeyEx, METH_FASTCALL, winreg_DeleteKeyEx__doc__},
 
 static PyObject *
 winreg_DeleteKeyEx_impl(PyObject *module, HKEY key, Py_UNICODE *sub_key,
                         REGSAM access, int reserved);
 
 static PyObject *
-winreg_DeleteKeyEx(PyObject *module, PyObject *args, PyObject *kwargs)
+winreg_DeleteKeyEx(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"key", "sub_key", "access", "reserved", NULL};
@@ -351,7 +351,7 @@
     REGSAM access = KEY_WOW64_64KEY;
     int reserved = 0;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         clinic_HKEY_converter, &key, &sub_key, &access, &reserved)) {
         goto exit;
     }
@@ -620,14 +620,14 @@
 "If the function fails, an OSError exception is raised.");
 
 #define WINREG_OPENKEY_METHODDEF    \
-    {"OpenKey", (PyCFunction)winreg_OpenKey, METH_VARARGS|METH_KEYWORDS, winreg_OpenKey__doc__},
+    {"OpenKey", (PyCFunction)winreg_OpenKey, METH_FASTCALL, winreg_OpenKey__doc__},
 
 static HKEY
 winreg_OpenKey_impl(PyObject *module, HKEY key, Py_UNICODE *sub_key,
                     int reserved, REGSAM access);
 
 static PyObject *
-winreg_OpenKey(PyObject *module, PyObject *args, PyObject *kwargs)
+winreg_OpenKey(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"key", "sub_key", "reserved", "access", NULL};
@@ -638,7 +638,7 @@
     REGSAM access = KEY_READ;
     HKEY _return_value;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         clinic_HKEY_converter, &key, &sub_key, &reserved, &access)) {
         goto exit;
     }
@@ -672,14 +672,14 @@
 "If the function fails, an OSError exception is raised.");
 
 #define WINREG_OPENKEYEX_METHODDEF    \
-    {"OpenKeyEx", (PyCFunction)winreg_OpenKeyEx, METH_VARARGS|METH_KEYWORDS, winreg_OpenKeyEx__doc__},
+    {"OpenKeyEx", (PyCFunction)winreg_OpenKeyEx, METH_FASTCALL, winreg_OpenKeyEx__doc__},
 
 static HKEY
 winreg_OpenKeyEx_impl(PyObject *module, HKEY key, Py_UNICODE *sub_key,
                       int reserved, REGSAM access);
 
 static PyObject *
-winreg_OpenKeyEx(PyObject *module, PyObject *args, PyObject *kwargs)
+winreg_OpenKeyEx(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"key", "sub_key", "reserved", "access", NULL};
@@ -690,7 +690,7 @@
     REGSAM access = KEY_READ;
     HKEY _return_value;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         clinic_HKEY_converter, &key, &sub_key, &reserved, &access)) {
         goto exit;
     }
@@ -1091,4 +1091,4 @@
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=5b53d19cbe3f37cd input=a9049054013a1b77]*/
+/*[clinic end generated code: output=16dd06be6e14b86e input=a9049054013a1b77]*/
diff --git a/PC/clinic/winsound.c.h b/PC/clinic/winsound.c.h
index 766479a..52d25b2 100644
--- a/PC/clinic/winsound.c.h
+++ b/PC/clinic/winsound.c.h
@@ -14,13 +14,13 @@
 "    Flag values, ored together.  See module documentation.");
 
 #define WINSOUND_PLAYSOUND_METHODDEF    \
-    {"PlaySound", (PyCFunction)winsound_PlaySound, METH_VARARGS|METH_KEYWORDS, winsound_PlaySound__doc__},
+    {"PlaySound", (PyCFunction)winsound_PlaySound, METH_FASTCALL, winsound_PlaySound__doc__},
 
 static PyObject *
 winsound_PlaySound_impl(PyObject *module, PyObject *sound, int flags);
 
 static PyObject *
-winsound_PlaySound(PyObject *module, PyObject *args, PyObject *kwargs)
+winsound_PlaySound(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"sound", "flags", NULL};
@@ -28,7 +28,7 @@
     PyObject *sound;
     int flags;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &sound, &flags)) {
         goto exit;
     }
@@ -51,13 +51,13 @@
 "    How long the sound should play, in milliseconds.");
 
 #define WINSOUND_BEEP_METHODDEF    \
-    {"Beep", (PyCFunction)winsound_Beep, METH_VARARGS|METH_KEYWORDS, winsound_Beep__doc__},
+    {"Beep", (PyCFunction)winsound_Beep, METH_FASTCALL, winsound_Beep__doc__},
 
 static PyObject *
 winsound_Beep_impl(PyObject *module, int frequency, int duration);
 
 static PyObject *
-winsound_Beep(PyObject *module, PyObject *args, PyObject *kwargs)
+winsound_Beep(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"frequency", "duration", NULL};
@@ -65,7 +65,7 @@
     int frequency;
     int duration;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &frequency, &duration)) {
         goto exit;
     }
@@ -84,20 +84,20 @@
 "x defaults to MB_OK.");
 
 #define WINSOUND_MESSAGEBEEP_METHODDEF    \
-    {"MessageBeep", (PyCFunction)winsound_MessageBeep, METH_VARARGS|METH_KEYWORDS, winsound_MessageBeep__doc__},
+    {"MessageBeep", (PyCFunction)winsound_MessageBeep, METH_FASTCALL, winsound_MessageBeep__doc__},
 
 static PyObject *
 winsound_MessageBeep_impl(PyObject *module, int type);
 
 static PyObject *
-winsound_MessageBeep(PyObject *module, PyObject *args, PyObject *kwargs)
+winsound_MessageBeep(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"type", NULL};
     static _PyArg_Parser _parser = {"|i:MessageBeep", _keywords, 0};
     int type = MB_OK;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &type)) {
         goto exit;
     }
@@ -106,4 +106,4 @@
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=40b3d3ef2faefb15 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=bfe16b2b8b490cb1 input=a9049054013a1b77]*/
diff --git a/Python/clinic/bltinmodule.c.h b/Python/clinic/bltinmodule.c.h
index 4c44340..c88deef 100644
--- a/Python/clinic/bltinmodule.c.h
+++ b/Python/clinic/bltinmodule.c.h
@@ -148,7 +148,7 @@
 "in addition to any features explicitly specified.");
 
 #define BUILTIN_COMPILE_METHODDEF    \
-    {"compile", (PyCFunction)builtin_compile, METH_VARARGS|METH_KEYWORDS, builtin_compile__doc__},
+    {"compile", (PyCFunction)builtin_compile, METH_FASTCALL, builtin_compile__doc__},
 
 static PyObject *
 builtin_compile_impl(PyObject *module, PyObject *source, PyObject *filename,
@@ -156,7 +156,7 @@
                      int optimize);
 
 static PyObject *
-builtin_compile(PyObject *module, PyObject *args, PyObject *kwargs)
+builtin_compile(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     static const char * const _keywords[] = {"source", "filename", "mode", "flags", "dont_inherit", "optimize", NULL};
@@ -168,7 +168,7 @@
     int dont_inherit = 0;
     int optimize = -1;
 
-    if (!_PyArg_ParseTupleAndKeywordsFast(args, kwargs, &_parser,
+    if (!_PyArg_ParseStack(args, nargs, kwnames, &_parser,
         &source, PyUnicode_FSDecoder, &filename, &mode, &flags, &dont_inherit, &optimize)) {
         goto exit;
     }
@@ -674,4 +674,4 @@
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=790cb3d26531dfda input=a9049054013a1b77]*/
+/*[clinic end generated code: output=63483deb75805f7c input=a9049054013a1b77]*/