diff --git a/Include/modsupport.h b/Include/modsupport.h
index a238bef..ed24b2b 100644
--- a/Include/modsupport.h
+++ b/Include/modsupport.h
@@ -66,6 +66,8 @@
 #define _PyArg_NoPositional(funcname, args) \
     ((args) == NULL || _PyArg_NoPositional((funcname), (args)))
 
+PyAPI_FUNC(void) _PyArg_BadArgument(const char *, const char *, PyObject *);
+
 #endif
 
 PyAPI_FUNC(PyObject *) Py_VaBuildValue(const char *, va_list);
diff --git a/Lib/test/clinic.test b/Lib/test/clinic.test
index 5f6fec8..03571a8 100644
--- a/Lib/test/clinic.test
+++ b/Lib/test/clinic.test
@@ -201,9 +201,11 @@
     PyObject *return_value = NULL;
     PyBytesObject *a;
 
-    if (!PyArg_Parse(arg, "S:test_PyBytesObject_converter", &a)) {
+    if (!PyBytes_Check(arg)) {
+        _PyArg_BadArgument("test_PyBytesObject_converter", "bytes", arg);
         goto exit;
     }
+    a = (PyBytesObject *)arg;
     return_value = test_PyBytesObject_converter_impl(module, a);
 
 exit:
@@ -212,7 +214,7 @@
 
 static PyObject *
 test_PyBytesObject_converter_impl(PyObject *module, PyBytesObject *a)
-/*[clinic end generated code: output=8dbf43c604ced031 input=12b10c7cb5750400]*/
+/*[clinic end generated code: output=fd69d6df4d26c853 input=12b10c7cb5750400]*/
 
 /*[clinic input]
 test_PyByteArrayObject_converter
@@ -239,9 +241,11 @@
     PyObject *return_value = NULL;
     PyByteArrayObject *a;
 
-    if (!PyArg_Parse(arg, "Y:test_PyByteArrayObject_converter", &a)) {
+    if (!PyByteArray_Check(arg)) {
+        _PyArg_BadArgument("test_PyByteArrayObject_converter", "bytearray", arg);
         goto exit;
     }
+    a = (PyByteArrayObject *)arg;
     return_value = test_PyByteArrayObject_converter_impl(module, a);
 
 exit:
@@ -250,7 +254,7 @@
 
 static PyObject *
 test_PyByteArrayObject_converter_impl(PyObject *module, PyByteArrayObject *a)
-/*[clinic end generated code: output=ade99fc6705e7d6e input=5a657da535d194ae]*/
+/*[clinic end generated code: output=d309c909182c4183 input=5a657da535d194ae]*/
 
 /*[clinic input]
 test_unicode_converter
@@ -277,9 +281,14 @@
     PyObject *return_value = NULL;
     PyObject *a;
 
-    if (!PyArg_Parse(arg, "U:test_unicode_converter", &a)) {
+    if (!PyUnicode_Check(arg)) {
+        _PyArg_BadArgument("test_unicode_converter", "str", arg);
         goto exit;
     }
+    if (PyUnicode_READY(arg) == -1) {
+        goto exit;
+    }
+    a = arg;
     return_value = test_unicode_converter_impl(module, a);
 
 exit:
@@ -288,7 +297,7 @@
 
 static PyObject *
 test_unicode_converter_impl(PyObject *module, PyObject *a)
-/*[clinic end generated code: output=504a2c8d00370adf input=aa33612df92aa9c5]*/
+/*[clinic end generated code: output=ca603454e1f8f764 input=aa33612df92aa9c5]*/
 
 /*[clinic input]
 test_bool_converter
@@ -1027,7 +1036,8 @@
     PyObject *return_value = NULL;
     Py_complex a;
 
-    if (!PyArg_Parse(arg, "D:test_Py_complex_converter", &a)) {
+    a = PyComplex_AsCComplex(arg);
+    if (PyErr_Occurred()) {
         goto exit;
     }
     return_value = test_Py_complex_converter_impl(module, a);
@@ -1038,7 +1048,7 @@
 
 static PyObject *
 test_Py_complex_converter_impl(PyObject *module, Py_complex a)
-/*[clinic end generated code: output=27efb4ff772d6170 input=070f216a515beb79]*/
+/*[clinic end generated code: output=c2ecbec2144ca540 input=070f216a515beb79]*/
 
 /*[clinic input]
 test_str_converter
diff --git a/Modules/_io/clinic/bufferedio.c.h b/Modules/_io/clinic/bufferedio.c.h
index e78ca20..6569e02 100644
--- a/Modules/_io/clinic/bufferedio.c.h
+++ b/Modules/_io/clinic/bufferedio.c.h
@@ -19,7 +19,13 @@
     PyObject *return_value = NULL;
     Py_buffer buffer = {NULL, NULL};
 
-    if (!PyArg_Parse(arg, "w*:readinto", &buffer)) {
+    if (PyObject_GetBuffer(arg, &buffer, PyBUF_WRITABLE) < 0) {
+        PyErr_Clear();
+        _PyArg_BadArgument("readinto", "read-write bytes-like object", arg);
+        goto exit;
+    }
+    if (!PyBuffer_IsContiguous(&buffer, 'C')) {
+        _PyArg_BadArgument("readinto", "contiguous buffer", arg);
         goto exit;
     }
     return_value = _io__BufferedIOBase_readinto_impl(self, &buffer);
@@ -50,7 +56,13 @@
     PyObject *return_value = NULL;
     Py_buffer buffer = {NULL, NULL};
 
-    if (!PyArg_Parse(arg, "w*:readinto1", &buffer)) {
+    if (PyObject_GetBuffer(arg, &buffer, PyBUF_WRITABLE) < 0) {
+        PyErr_Clear();
+        _PyArg_BadArgument("readinto1", "read-write bytes-like object", arg);
+        goto exit;
+    }
+    if (!PyBuffer_IsContiguous(&buffer, 'C')) {
+        _PyArg_BadArgument("readinto1", "contiguous buffer", arg);
         goto exit;
     }
     return_value = _io__BufferedIOBase_readinto1_impl(self, &buffer);
@@ -183,7 +195,13 @@
     PyObject *return_value = NULL;
     Py_buffer buffer = {NULL, NULL};
 
-    if (!PyArg_Parse(arg, "w*:readinto", &buffer)) {
+    if (PyObject_GetBuffer(arg, &buffer, PyBUF_WRITABLE) < 0) {
+        PyErr_Clear();
+        _PyArg_BadArgument("readinto", "read-write bytes-like object", arg);
+        goto exit;
+    }
+    if (!PyBuffer_IsContiguous(&buffer, 'C')) {
+        _PyArg_BadArgument("readinto", "contiguous buffer", arg);
         goto exit;
     }
     return_value = _io__Buffered_readinto_impl(self, &buffer);
@@ -214,7 +232,13 @@
     PyObject *return_value = NULL;
     Py_buffer buffer = {NULL, NULL};
 
-    if (!PyArg_Parse(arg, "w*:readinto1", &buffer)) {
+    if (PyObject_GetBuffer(arg, &buffer, PyBUF_WRITABLE) < 0) {
+        PyErr_Clear();
+        _PyArg_BadArgument("readinto1", "read-write bytes-like object", arg);
+        goto exit;
+    }
+    if (!PyBuffer_IsContiguous(&buffer, 'C')) {
+        _PyArg_BadArgument("readinto1", "contiguous buffer", arg);
         goto exit;
     }
     return_value = _io__Buffered_readinto1_impl(self, &buffer);
@@ -390,7 +414,11 @@
     PyObject *return_value = NULL;
     Py_buffer buffer = {NULL, NULL};
 
-    if (!PyArg_Parse(arg, "y*:write", &buffer)) {
+    if (PyObject_GetBuffer(arg, &buffer, PyBUF_SIMPLE) != 0) {
+        goto exit;
+    }
+    if (!PyBuffer_IsContiguous(&buffer, 'C')) {
+        _PyArg_BadArgument("write", "contiguous buffer", arg);
         goto exit;
     }
     return_value = _io_BufferedWriter_write_impl(self, &buffer);
@@ -476,4 +504,4 @@
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=cb4bf8d50533953b input=a9049054013a1b77]*/
+/*[clinic end generated code: output=40de95d461a20782 input=a9049054013a1b77]*/
diff --git a/Modules/_io/clinic/bytesio.c.h b/Modules/_io/clinic/bytesio.c.h
index 536f753..07c8866 100644
--- a/Modules/_io/clinic/bytesio.c.h
+++ b/Modules/_io/clinic/bytesio.c.h
@@ -296,7 +296,13 @@
     PyObject *return_value = NULL;
     Py_buffer buffer = {NULL, NULL};
 
-    if (!PyArg_Parse(arg, "w*:readinto", &buffer)) {
+    if (PyObject_GetBuffer(arg, &buffer, PyBUF_WRITABLE) < 0) {
+        PyErr_Clear();
+        _PyArg_BadArgument("readinto", "read-write bytes-like object", arg);
+        goto exit;
+    }
+    if (!PyBuffer_IsContiguous(&buffer, 'C')) {
+        _PyArg_BadArgument("readinto", "contiguous buffer", arg);
         goto exit;
     }
     return_value = _io_BytesIO_readinto_impl(self, &buffer);
@@ -444,4 +450,4 @@
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=89538a941ae1267a input=a9049054013a1b77]*/
+/*[clinic end generated code: output=f6e720f38fc6e3cd input=a9049054013a1b77]*/
diff --git a/Modules/_io/clinic/fileio.c.h b/Modules/_io/clinic/fileio.c.h
index a66fc99..bf40f7f 100644
--- a/Modules/_io/clinic/fileio.c.h
+++ b/Modules/_io/clinic/fileio.c.h
@@ -156,7 +156,13 @@
     PyObject *return_value = NULL;
     Py_buffer buffer = {NULL, NULL};
 
-    if (!PyArg_Parse(arg, "w*:readinto", &buffer)) {
+    if (PyObject_GetBuffer(arg, &buffer, PyBUF_WRITABLE) < 0) {
+        PyErr_Clear();
+        _PyArg_BadArgument("readinto", "read-write bytes-like object", arg);
+        goto exit;
+    }
+    if (!PyBuffer_IsContiguous(&buffer, 'C')) {
+        _PyArg_BadArgument("readinto", "contiguous buffer", arg);
         goto exit;
     }
     return_value = _io_FileIO_readinto_impl(self, &buffer);
@@ -245,7 +251,11 @@
     PyObject *return_value = NULL;
     Py_buffer b = {NULL, NULL};
 
-    if (!PyArg_Parse(arg, "y*:write", &b)) {
+    if (PyObject_GetBuffer(arg, &b, PyBUF_SIMPLE) != 0) {
+        goto exit;
+    }
+    if (!PyBuffer_IsContiguous(&b, 'C')) {
+        _PyArg_BadArgument("write", "contiguous buffer", arg);
         goto exit;
     }
     return_value = _io_FileIO_write_impl(self, &b);
@@ -373,4 +383,4 @@
 #ifndef _IO_FILEIO_TRUNCATE_METHODDEF
     #define _IO_FILEIO_TRUNCATE_METHODDEF
 #endif /* !defined(_IO_FILEIO_TRUNCATE_METHODDEF) */
-/*[clinic end generated code: output=9d44e7035bce105d input=a9049054013a1b77]*/
+/*[clinic end generated code: output=8be0ea9a5ac7aa43 input=a9049054013a1b77]*/
diff --git a/Modules/_io/clinic/textio.c.h b/Modules/_io/clinic/textio.c.h
index 3ad3d67..f056416e 100644
--- a/Modules/_io/clinic/textio.c.h
+++ b/Modules/_io/clinic/textio.c.h
@@ -250,9 +250,14 @@
     PyObject *return_value = NULL;
     PyObject *text;
 
-    if (!PyArg_Parse(arg, "U:write", &text)) {
+    if (!PyUnicode_Check(arg)) {
+        _PyArg_BadArgument("write", "str", arg);
         goto exit;
     }
+    if (PyUnicode_READY(arg) == -1) {
+        goto exit;
+    }
+    text = arg;
     return_value = _io_TextIOWrapper_write_impl(self, text);
 
 exit:
@@ -504,4 +509,4 @@
 {
     return _io_TextIOWrapper_close_impl(self);
 }
-/*[clinic end generated code: output=a811badd76bfe92e input=a9049054013a1b77]*/
+/*[clinic end generated code: output=b933f08c2f2d85cd input=a9049054013a1b77]*/
diff --git a/Modules/_io/clinic/winconsoleio.c.h b/Modules/_io/clinic/winconsoleio.c.h
index 6e72da1..65cac66 100644
--- a/Modules/_io/clinic/winconsoleio.c.h
+++ b/Modules/_io/clinic/winconsoleio.c.h
@@ -156,7 +156,13 @@
     PyObject *return_value = NULL;
     Py_buffer buffer = {NULL, NULL};
 
-    if (!PyArg_Parse(arg, "w*:readinto", &buffer)) {
+    if (PyObject_GetBuffer(arg, &buffer, PyBUF_WRITABLE) < 0) {
+        PyErr_Clear();
+        _PyArg_BadArgument("readinto", "read-write bytes-like object", arg);
+        goto exit;
+    }
+    if (!PyBuffer_IsContiguous(&buffer, 'C')) {
+        _PyArg_BadArgument("readinto", "contiguous buffer", arg);
         goto exit;
     }
     return_value = _io__WindowsConsoleIO_readinto_impl(self, &buffer);
@@ -255,7 +261,11 @@
     PyObject *return_value = NULL;
     Py_buffer b = {NULL, NULL};
 
-    if (!PyArg_Parse(arg, "y*:write", &b)) {
+    if (PyObject_GetBuffer(arg, &b, PyBUF_SIMPLE) != 0) {
+        goto exit;
+    }
+    if (!PyBuffer_IsContiguous(&b, 'C')) {
+        _PyArg_BadArgument("write", "contiguous buffer", arg);
         goto exit;
     }
     return_value = _io__WindowsConsoleIO_write_impl(self, &b);
@@ -328,4 +338,4 @@
 #ifndef _IO__WINDOWSCONSOLEIO_ISATTY_METHODDEF
     #define _IO__WINDOWSCONSOLEIO_ISATTY_METHODDEF
 #endif /* !defined(_IO__WINDOWSCONSOLEIO_ISATTY_METHODDEF) */
-/*[clinic end generated code: output=080af41338394b49 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=4337e8de65915a1e input=a9049054013a1b77]*/
diff --git a/Modules/_sha3/clinic/sha3module.c.h b/Modules/_sha3/clinic/sha3module.c.h
index b2a896e..554442d 100644
--- a/Modules/_sha3/clinic/sha3module.c.h
+++ b/Modules/_sha3/clinic/sha3module.c.h
@@ -83,7 +83,7 @@
     PyObject *return_value = NULL;
     unsigned long length;
 
-    if (!PyArg_Parse(arg, "O&:digest", _PyLong_UnsignedLong_Converter, &length)) {
+    if (!_PyLong_UnsignedLong_Converter(arg, &length)) {
         goto exit;
     }
     return_value = _sha3_shake_128_digest_impl(self, length);
@@ -110,7 +110,7 @@
     PyObject *return_value = NULL;
     unsigned long length;
 
-    if (!PyArg_Parse(arg, "O&:hexdigest", _PyLong_UnsignedLong_Converter, &length)) {
+    if (!_PyLong_UnsignedLong_Converter(arg, &length)) {
         goto exit;
     }
     return_value = _sha3_shake_128_hexdigest_impl(self, length);
@@ -118,4 +118,4 @@
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=bf823532a7bffe68 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=5b3e99b9a96471e8 input=a9049054013a1b77]*/
diff --git a/Modules/_struct.c b/Modules/_struct.c
index 6767330..5954c13 100644
--- a/Modules/_struct.c
+++ b/Modules/_struct.c
@@ -96,7 +96,7 @@
 [python start generated code]*/
 /*[python end generated code: output=da39a3ee5e6b4b0d input=49957cca130ffb63]*/
 
-static int cache_struct_converter(PyObject *, PyObject **);
+static int cache_struct_converter(PyObject *, PyStructObject **);
 
 #include "clinic/_struct.c.h"
 
@@ -2072,7 +2072,7 @@
 static PyObject *cache = NULL;
 
 static int
-cache_struct_converter(PyObject *fmt, PyObject **ptr)
+cache_struct_converter(PyObject *fmt, PyStructObject **ptr)
 {
     PyObject * s_object;
 
@@ -2091,7 +2091,7 @@
     s_object = PyDict_GetItem(cache, fmt);
     if (s_object != NULL) {
         Py_INCREF(s_object);
-        *ptr = s_object;
+        *ptr = (PyStructObject *)s_object;
         return Py_CLEANUP_SUPPORTED;
     }
 
@@ -2102,7 +2102,7 @@
         /* Attempt to cache the result */
         if (PyDict_SetItem(cache, fmt, s_object) == -1)
             PyErr_Clear();
-        *ptr = s_object;
+        *ptr = (PyStructObject *)s_object;
         return Py_CLEANUP_SUPPORTED;
     }
     return 0;
@@ -2157,7 +2157,7 @@
     }
     format = args[0];
 
-    if (!cache_struct_converter(format, &s_object)) {
+    if (!cache_struct_converter(format, (PyStructObject **)&s_object)) {
         return NULL;
     }
     result = s_pack(s_object, args + 1, nargs - 1);
@@ -2185,7 +2185,7 @@
     }
     format = args[0];
 
-    if (!cache_struct_converter(format, &s_object)) {
+    if (!cache_struct_converter(format, (PyStructObject **)&s_object)) {
         return NULL;
     }
     result = s_pack_into(s_object, args + 1, nargs - 1);
diff --git a/Modules/cjkcodecs/clinic/multibytecodec.c.h b/Modules/cjkcodecs/clinic/multibytecodec.c.h
index 74e45bd..1fef185 100644
--- a/Modules/cjkcodecs/clinic/multibytecodec.c.h
+++ b/Modules/cjkcodecs/clinic/multibytecodec.c.h
@@ -150,9 +150,11 @@
     PyObject *return_value = NULL;
     PyLongObject *statelong;
 
-    if (!PyArg_Parse(arg, "O!:setstate", &PyLong_Type, &statelong)) {
+    if (!PyLong_Check(arg)) {
+        _PyArg_BadArgument("setstate", "int", arg);
         goto exit;
     }
+    statelong = (PyLongObject *)arg;
     return_value = _multibytecodec_MultibyteIncrementalEncoder_setstate_impl(self, statelong);
 
 exit:
@@ -248,9 +250,11 @@
     PyObject *return_value = NULL;
     PyObject *state;
 
-    if (!PyArg_Parse(arg, "O!:setstate", &PyTuple_Type, &state)) {
+    if (!PyTuple_Check(arg)) {
+        _PyArg_BadArgument("setstate", "tuple", arg);
         goto exit;
     }
+    state = arg;
     return_value = _multibytecodec_MultibyteIncrementalDecoder_setstate_impl(self, state);
 
 exit:
@@ -418,4 +422,4 @@
 
 #define _MULTIBYTECODEC___CREATE_CODEC_METHODDEF    \
     {"__create_codec", (PyCFunction)_multibytecodec___create_codec, METH_O, _multibytecodec___create_codec__doc__},
-/*[clinic end generated code: output=4c1dc8015ee5abb4 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=a94364d0965adf1d input=a9049054013a1b77]*/
diff --git a/Modules/clinic/_bz2module.c.h b/Modules/clinic/_bz2module.c.h
index f538719..dce746d 100644
--- a/Modules/clinic/_bz2module.c.h
+++ b/Modules/clinic/_bz2module.c.h
@@ -25,7 +25,11 @@
     PyObject *return_value = NULL;
     Py_buffer data = {NULL, NULL};
 
-    if (!PyArg_Parse(arg, "y*:compress", &data)) {
+    if (PyObject_GetBuffer(arg, &data, PyBUF_SIMPLE) != 0) {
+        goto exit;
+    }
+    if (!PyBuffer_IsContiguous(&data, 'C')) {
+        _PyArg_BadArgument("compress", "contiguous buffer", arg);
         goto exit;
     }
     return_value = _bz2_BZ2Compressor_compress_impl(self, &data);
@@ -174,4 +178,4 @@
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=e47f4255d265b07d input=a9049054013a1b77]*/
+/*[clinic end generated code: output=8549cccdb82f57d9 input=a9049054013a1b77]*/
diff --git a/Modules/clinic/_codecsmodule.c.h b/Modules/clinic/_codecsmodule.c.h
index 06f0572..360a134 100644
--- a/Modules/clinic/_codecsmodule.c.h
+++ b/Modules/clinic/_codecsmodule.c.h
@@ -33,7 +33,17 @@
     PyObject *return_value = NULL;
     const char *encoding;
 
-    if (!PyArg_Parse(arg, "s:lookup", &encoding)) {
+    if (!PyUnicode_Check(arg)) {
+        _PyArg_BadArgument("lookup", "str", arg);
+        goto exit;
+    }
+    Py_ssize_t encoding_length;
+    encoding = PyUnicode_AsUTF8AndSize(arg, &encoding_length);
+    if (encoding == NULL) {
+        goto exit;
+    }
+    if (strlen(encoding) != (size_t)encoding_length) {
+        PyErr_SetString(PyExc_ValueError, "embedded null character");
         goto exit;
     }
     return_value = _codecs_lookup_impl(module, encoding);
@@ -138,7 +148,17 @@
     PyObject *return_value = NULL;
     const char *encoding;
 
-    if (!PyArg_Parse(arg, "s:_forget_codec", &encoding)) {
+    if (!PyUnicode_Check(arg)) {
+        _PyArg_BadArgument("_forget_codec", "str", arg);
+        goto exit;
+    }
+    Py_ssize_t encoding_length;
+    encoding = PyUnicode_AsUTF8AndSize(arg, &encoding_length);
+    if (encoding == NULL) {
+        goto exit;
+    }
+    if (strlen(encoding) != (size_t)encoding_length) {
+        PyErr_SetString(PyExc_ValueError, "embedded null character");
         goto exit;
     }
     return_value = _codecs__forget_codec_impl(module, encoding);
@@ -1342,9 +1362,14 @@
     PyObject *return_value = NULL;
     PyObject *map;
 
-    if (!PyArg_Parse(arg, "U:charmap_build", &map)) {
+    if (!PyUnicode_Check(arg)) {
+        _PyArg_BadArgument("charmap_build", "str", arg);
         goto exit;
     }
+    if (PyUnicode_READY(arg) == -1) {
+        goto exit;
+    }
+    map = arg;
     return_value = _codecs_charmap_build_impl(module, map);
 
 exit:
@@ -1504,7 +1529,17 @@
     PyObject *return_value = NULL;
     const char *name;
 
-    if (!PyArg_Parse(arg, "s:lookup_error", &name)) {
+    if (!PyUnicode_Check(arg)) {
+        _PyArg_BadArgument("lookup_error", "str", arg);
+        goto exit;
+    }
+    Py_ssize_t name_length;
+    name = PyUnicode_AsUTF8AndSize(arg, &name_length);
+    if (name == NULL) {
+        goto exit;
+    }
+    if (strlen(name) != (size_t)name_length) {
+        PyErr_SetString(PyExc_ValueError, "embedded null character");
         goto exit;
     }
     return_value = _codecs_lookup_error_impl(module, name);
@@ -1536,4 +1571,4 @@
 #ifndef _CODECS_CODE_PAGE_ENCODE_METHODDEF
     #define _CODECS_CODE_PAGE_ENCODE_METHODDEF
 #endif /* !defined(_CODECS_CODE_PAGE_ENCODE_METHODDEF) */
-/*[clinic end generated code: output=d29fe7c0cb206812 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=c2d2b917b78a4c45 input=a9049054013a1b77]*/
diff --git a/Modules/clinic/_curses_panel.c.h b/Modules/clinic/_curses_panel.c.h
index 4f3f593..2e569c5 100644
--- a/Modules/clinic/_curses_panel.c.h
+++ b/Modules/clinic/_curses_panel.c.h
@@ -196,9 +196,11 @@
     PyObject *return_value = NULL;
     PyCursesWindowObject *win;
 
-    if (!PyArg_Parse(arg, "O!:replace", &PyCursesWindow_Type, &win)) {
+    if (!PyObject_TypeCheck(arg, &PyCursesWindow_Type)) {
+        _PyArg_BadArgument("replace", (&PyCursesWindow_Type)->tp_name, arg);
         goto exit;
     }
+    win = (PyCursesWindowObject *)arg;
     return_value = _curses_panel_panel_replace_impl(self, win);
 
 exit:
@@ -268,9 +270,11 @@
     PyObject *return_value = NULL;
     PyCursesWindowObject *win;
 
-    if (!PyArg_Parse(arg, "O!:new_panel", &PyCursesWindow_Type, &win)) {
+    if (!PyObject_TypeCheck(arg, &PyCursesWindow_Type)) {
+        _PyArg_BadArgument("new_panel", (&PyCursesWindow_Type)->tp_name, arg);
         goto exit;
     }
+    win = (PyCursesWindowObject *)arg;
     return_value = _curses_panel_new_panel_impl(module, win);
 
 exit:
@@ -314,4 +318,4 @@
 {
     return _curses_panel_update_panels_impl(module);
 }
-/*[clinic end generated code: output=66e49cb9726a638f input=a9049054013a1b77]*/
+/*[clinic end generated code: output=4b211b4015e29100 input=a9049054013a1b77]*/
diff --git a/Modules/clinic/_cursesmodule.c.h b/Modules/clinic/_cursesmodule.c.h
index ac921d5..01c7097 100644
--- a/Modules/clinic/_cursesmodule.c.h
+++ b/Modules/clinic/_cursesmodule.c.h
@@ -273,7 +273,13 @@
     PyObject *return_value = NULL;
     long attr;
 
-    if (!PyArg_Parse(arg, "l:attroff", &attr)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    attr = PyLong_AsLong(arg);
+    if (attr == -1 && PyErr_Occurred()) {
         goto exit;
     }
     return_value = _curses_window_attroff_impl(self, attr);
@@ -300,7 +306,13 @@
     PyObject *return_value = NULL;
     long attr;
 
-    if (!PyArg_Parse(arg, "l:attron", &attr)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    attr = PyLong_AsLong(arg);
+    if (attr == -1 && PyErr_Occurred()) {
         goto exit;
     }
     return_value = _curses_window_attron_impl(self, attr);
@@ -327,7 +339,13 @@
     PyObject *return_value = NULL;
     long attr;
 
-    if (!PyArg_Parse(arg, "l:attrset", &attr)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    attr = PyLong_AsLong(arg);
+    if (attr == -1 && PyErr_Occurred()) {
         goto exit;
     }
     return_value = _curses_window_attrset_impl(self, attr);
@@ -1198,7 +1216,13 @@
     PyObject *return_value = NULL;
     int line;
 
-    if (!PyArg_Parse(arg, "i:is_linetouched", &line)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    line = _PyLong_AsInt(arg);
+    if (line == -1 && PyErr_Occurred()) {
         goto exit;
     }
     return_value = _curses_window_is_linetouched_impl(self, line);
@@ -1888,9 +1912,30 @@
     PyObject *return_value = NULL;
     short color_number;
 
-    if (!PyArg_Parse(arg, "h:color_content", &color_number)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
         goto exit;
     }
+    {
+        long ival = PyLong_AsLong(arg);
+        if (ival == -1 && PyErr_Occurred()) {
+            goto exit;
+        }
+        else if (ival < SHRT_MIN) {
+            PyErr_SetString(PyExc_OverflowError,
+                            "signed short integer is less than minimum");
+            goto exit;
+        }
+        else if (ival > SHRT_MAX) {
+            PyErr_SetString(PyExc_OverflowError,
+                            "signed short integer is greater than maximum");
+            goto exit;
+        }
+        else {
+            color_number = (short) ival;
+        }
+    }
     return_value = _curses_color_content_impl(module, color_number);
 
 exit:
@@ -1921,9 +1966,30 @@
     PyObject *return_value = NULL;
     short color_number;
 
-    if (!PyArg_Parse(arg, "h:color_pair", &color_number)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
         goto exit;
     }
+    {
+        long ival = PyLong_AsLong(arg);
+        if (ival == -1 && PyErr_Occurred()) {
+            goto exit;
+        }
+        else if (ival < SHRT_MIN) {
+            PyErr_SetString(PyExc_OverflowError,
+                            "signed short integer is less than minimum");
+            goto exit;
+        }
+        else if (ival > SHRT_MAX) {
+            PyErr_SetString(PyExc_OverflowError,
+                            "signed short integer is greater than maximum");
+            goto exit;
+        }
+        else {
+            color_number = (short) ival;
+        }
+    }
     return_value = _curses_color_pair_impl(module, color_number);
 
 exit:
@@ -1956,7 +2022,13 @@
     PyObject *return_value = NULL;
     int visibility;
 
-    if (!PyArg_Parse(arg, "i:curs_set", &visibility)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    visibility = _PyLong_AsInt(arg);
+    if (visibility == -1 && PyErr_Occurred()) {
         goto exit;
     }
     return_value = _curses_curs_set_impl(module, visibility);
@@ -2030,7 +2102,13 @@
     PyObject *return_value = NULL;
     int ms;
 
-    if (!PyArg_Parse(arg, "i:delay_output", &ms)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    ms = _PyLong_AsInt(arg);
+    if (ms == -1 && PyErr_Occurred()) {
         goto exit;
     }
     return_value = _curses_delay_output_impl(module, ms);
@@ -2290,9 +2368,30 @@
     PyObject *return_value = NULL;
     unsigned char tenths;
 
-    if (!PyArg_Parse(arg, "b:halfdelay", &tenths)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
         goto exit;
     }
+    {
+        long ival = PyLong_AsLong(arg);
+        if (ival == -1 && PyErr_Occurred()) {
+            goto exit;
+        }
+        else if (ival < 0) {
+            PyErr_SetString(PyExc_OverflowError,
+                            "unsigned byte integer is less than minimum");
+            goto exit;
+        }
+        else if (ival > UCHAR_MAX) {
+            PyErr_SetString(PyExc_OverflowError,
+                            "unsigned byte integer is greater than maximum");
+            goto exit;
+        }
+        else {
+            tenths = (unsigned char) ival;
+        }
+    }
     return_value = _curses_halfdelay_impl(module, tenths);
 
 exit:
@@ -2376,7 +2475,13 @@
     PyObject *return_value = NULL;
     int key;
 
-    if (!PyArg_Parse(arg, "i:has_key", &key)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    key = _PyLong_AsInt(arg);
+    if (key == -1 && PyErr_Occurred()) {
         goto exit;
     }
     return_value = _curses_has_key_impl(module, key);
@@ -2548,7 +2653,13 @@
     PyObject *return_value = NULL;
     int flag;
 
-    if (!PyArg_Parse(arg, "i:intrflush", &flag)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    flag = _PyLong_AsInt(arg);
+    if (flag == -1 && PyErr_Occurred()) {
         goto exit;
     }
     return_value = _curses_intrflush_impl(module, flag);
@@ -2634,7 +2745,13 @@
     PyObject *return_value = NULL;
     int key;
 
-    if (!PyArg_Parse(arg, "i:keyname", &key)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    key = _PyLong_AsInt(arg);
+    if (key == -1 && PyErr_Occurred()) {
         goto exit;
     }
     return_value = _curses_keyname_impl(module, key);
@@ -2703,7 +2820,13 @@
     PyObject *return_value = NULL;
     int yes;
 
-    if (!PyArg_Parse(arg, "i:meta", &yes)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    yes = _PyLong_AsInt(arg);
+    if (yes == -1 && PyErr_Occurred()) {
         goto exit;
     }
     return_value = _curses_meta_impl(module, yes);
@@ -2739,7 +2862,13 @@
     PyObject *return_value = NULL;
     int interval;
 
-    if (!PyArg_Parse(arg, "i:mouseinterval", &interval)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    interval = _PyLong_AsInt(arg);
+    if (interval == -1 && PyErr_Occurred()) {
         goto exit;
     }
     return_value = _curses_mouseinterval_impl(module, interval);
@@ -2775,9 +2904,11 @@
     PyObject *return_value = NULL;
     unsigned long newmask;
 
-    if (!PyArg_Parse(arg, "k:mousemask", &newmask)) {
+    if (!PyLong_Check(arg)) {
+        _PyArg_BadArgument("mousemask", "int", arg);
         goto exit;
     }
+    newmask = PyLong_AsUnsignedLongMask(arg);
     return_value = _curses_mousemask_impl(module, newmask);
 
 exit:
@@ -2807,7 +2938,13 @@
     PyObject *return_value = NULL;
     int ms;
 
-    if (!PyArg_Parse(arg, "i:napms", &ms)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    ms = _PyLong_AsInt(arg);
+    if (ms == -1 && PyErr_Occurred()) {
         goto exit;
     }
     return_value = _curses_napms_impl(module, ms);
@@ -3062,9 +3199,30 @@
     PyObject *return_value = NULL;
     short pair_number;
 
-    if (!PyArg_Parse(arg, "h:pair_content", &pair_number)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
         goto exit;
     }
+    {
+        long ival = PyLong_AsLong(arg);
+        if (ival == -1 && PyErr_Occurred()) {
+            goto exit;
+        }
+        else if (ival < SHRT_MIN) {
+            PyErr_SetString(PyExc_OverflowError,
+                            "signed short integer is less than minimum");
+            goto exit;
+        }
+        else if (ival > SHRT_MAX) {
+            PyErr_SetString(PyExc_OverflowError,
+                            "signed short integer is greater than maximum");
+            goto exit;
+        }
+        else {
+            pair_number = (short) ival;
+        }
+    }
     return_value = _curses_pair_content_impl(module, pair_number);
 
 exit:
@@ -3091,7 +3249,13 @@
     PyObject *return_value = NULL;
     int attr;
 
-    if (!PyArg_Parse(arg, "i:pair_number", &attr)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    attr = _PyLong_AsInt(arg);
+    if (attr == -1 && PyErr_Occurred()) {
         goto exit;
     }
     return_value = _curses_pair_number_impl(module, attr);
@@ -3511,7 +3675,17 @@
     PyObject *return_value = NULL;
     const char *capname;
 
-    if (!PyArg_Parse(arg, "s:tigetflag", &capname)) {
+    if (!PyUnicode_Check(arg)) {
+        _PyArg_BadArgument("tigetflag", "str", arg);
+        goto exit;
+    }
+    Py_ssize_t capname_length;
+    capname = PyUnicode_AsUTF8AndSize(arg, &capname_length);
+    if (capname == NULL) {
+        goto exit;
+    }
+    if (strlen(capname) != (size_t)capname_length) {
+        PyErr_SetString(PyExc_ValueError, "embedded null character");
         goto exit;
     }
     return_value = _curses_tigetflag_impl(module, capname);
@@ -3544,7 +3718,17 @@
     PyObject *return_value = NULL;
     const char *capname;
 
-    if (!PyArg_Parse(arg, "s:tigetnum", &capname)) {
+    if (!PyUnicode_Check(arg)) {
+        _PyArg_BadArgument("tigetnum", "str", arg);
+        goto exit;
+    }
+    Py_ssize_t capname_length;
+    capname = PyUnicode_AsUTF8AndSize(arg, &capname_length);
+    if (capname == NULL) {
+        goto exit;
+    }
+    if (strlen(capname) != (size_t)capname_length) {
+        PyErr_SetString(PyExc_ValueError, "embedded null character");
         goto exit;
     }
     return_value = _curses_tigetnum_impl(module, capname);
@@ -3577,7 +3761,17 @@
     PyObject *return_value = NULL;
     const char *capname;
 
-    if (!PyArg_Parse(arg, "s:tigetstr", &capname)) {
+    if (!PyUnicode_Check(arg)) {
+        _PyArg_BadArgument("tigetstr", "str", arg);
+        goto exit;
+    }
+    Py_ssize_t capname_length;
+    capname = PyUnicode_AsUTF8AndSize(arg, &capname_length);
+    if (capname == NULL) {
+        goto exit;
+    }
+    if (strlen(capname) != (size_t)capname_length) {
+        PyErr_SetString(PyExc_ValueError, "embedded null character");
         goto exit;
     }
     return_value = _curses_tigetstr_impl(module, capname);
@@ -3653,7 +3847,13 @@
     PyObject *return_value = NULL;
     int fd;
 
-    if (!PyArg_Parse(arg, "i:typeahead", &fd)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    fd = _PyLong_AsInt(arg);
+    if (fd == -1 && PyErr_Occurred()) {
         goto exit;
     }
     return_value = _curses_typeahead_impl(module, fd);
@@ -3727,7 +3927,13 @@
     PyObject *return_value = NULL;
     int flag;
 
-    if (!PyArg_Parse(arg, "i:use_env", &flag)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    flag = _PyLong_AsInt(arg);
+    if (flag == -1 && PyErr_Occurred()) {
         goto exit;
     }
     return_value = _curses_use_env_impl(module, flag);
@@ -3838,4 +4044,4 @@
 #ifndef _CURSES_USE_DEFAULT_COLORS_METHODDEF
     #define _CURSES_USE_DEFAULT_COLORS_METHODDEF
 #endif /* !defined(_CURSES_USE_DEFAULT_COLORS_METHODDEF) */
-/*[clinic end generated code: output=177ad1d0b5586aaa input=a9049054013a1b77]*/
+/*[clinic end generated code: output=a2bbced3c5d29d64 input=a9049054013a1b77]*/
diff --git a/Modules/clinic/_elementtree.c.h b/Modules/clinic/_elementtree.c.h
index f7dc12e..e5107eb 100644
--- a/Modules/clinic/_elementtree.c.h
+++ b/Modules/clinic/_elementtree.c.h
@@ -19,9 +19,11 @@
     PyObject *return_value = NULL;
     PyObject *subelement;
 
-    if (!PyArg_Parse(arg, "O!:append", &Element_Type, &subelement)) {
+    if (!PyObject_TypeCheck(arg, &Element_Type)) {
+        _PyArg_BadArgument("append", (&Element_Type)->tp_name, arg);
         goto exit;
     }
+    subelement = arg;
     return_value = _elementtree_Element_append_impl(self, subelement);
 
 exit:
@@ -79,9 +81,11 @@
     PyObject *return_value = NULL;
     PyObject *memo;
 
-    if (!PyArg_Parse(arg, "O!:__deepcopy__", &PyDict_Type, &memo)) {
+    if (!PyDict_Check(arg)) {
+        _PyArg_BadArgument("__deepcopy__", "dict", arg);
         goto exit;
     }
+    memo = arg;
     return_value = _elementtree_Element___deepcopy___impl(self, memo);
 
 exit:
@@ -507,9 +511,11 @@
     PyObject *return_value = NULL;
     PyObject *subelement;
 
-    if (!PyArg_Parse(arg, "O!:remove", &Element_Type, &subelement)) {
+    if (!PyObject_TypeCheck(arg, &Element_Type)) {
+        _PyArg_BadArgument("remove", (&Element_Type)->tp_name, arg);
         goto exit;
     }
+    subelement = arg;
     return_value = _elementtree_Element_remove_impl(self, subelement);
 
 exit:
@@ -717,4 +723,4 @@
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=f1efdb511a5b027b input=a9049054013a1b77]*/
+/*[clinic end generated code: output=398640585689c5ed input=a9049054013a1b77]*/
diff --git a/Modules/clinic/_lzmamodule.c.h b/Modules/clinic/_lzmamodule.c.h
index 3e938c3..46d2988 100644
--- a/Modules/clinic/_lzmamodule.c.h
+++ b/Modules/clinic/_lzmamodule.c.h
@@ -25,7 +25,11 @@
     PyObject *return_value = NULL;
     Py_buffer data = {NULL, NULL};
 
-    if (!PyArg_Parse(arg, "y*:compress", &data)) {
+    if (PyObject_GetBuffer(arg, &data, PyBUF_SIMPLE) != 0) {
+        goto exit;
+    }
+    if (!PyBuffer_IsContiguous(&data, 'C')) {
+        _PyArg_BadArgument("compress", "contiguous buffer", arg);
         goto exit;
     }
     return_value = _lzma_LZMACompressor_compress_impl(self, &data);
@@ -178,7 +182,13 @@
     PyObject *return_value = NULL;
     int check_id;
 
-    if (!PyArg_Parse(arg, "i:is_check_supported", &check_id)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    check_id = _PyLong_AsInt(arg);
+    if (check_id == -1 && PyErr_Occurred()) {
         goto exit;
     }
     return_value = _lzma_is_check_supported_impl(module, check_id);
@@ -207,7 +217,7 @@
     PyObject *return_value = NULL;
     lzma_filter filter = {LZMA_VLI_UNKNOWN, NULL};
 
-    if (!PyArg_Parse(arg, "O&:_encode_filter_properties", lzma_filter_converter, &filter)) {
+    if (!lzma_filter_converter(arg, &filter)) {
         goto exit;
     }
     return_value = _lzma__encode_filter_properties_impl(module, filter);
@@ -256,4 +266,4 @@
 
     return return_value;
 }
-/*[clinic end generated code: output=2acfd7c4b68530a6 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=df061bfc2067a90a input=a9049054013a1b77]*/
diff --git a/Modules/clinic/_sre.c.h b/Modules/clinic/_sre.c.h
index fbc5ba4..e8a3665 100644
--- a/Modules/clinic/_sre.c.h
+++ b/Modules/clinic/_sre.c.h
@@ -47,7 +47,13 @@
     int character;
     int _return_value;
 
-    if (!PyArg_Parse(arg, "i:ascii_iscased", &character)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    character = _PyLong_AsInt(arg);
+    if (character == -1 && PyErr_Occurred()) {
         goto exit;
     }
     _return_value = _sre_ascii_iscased_impl(module, character);
@@ -78,7 +84,13 @@
     int character;
     int _return_value;
 
-    if (!PyArg_Parse(arg, "i:unicode_iscased", &character)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    character = _PyLong_AsInt(arg);
+    if (character == -1 && PyErr_Occurred()) {
         goto exit;
     }
     _return_value = _sre_unicode_iscased_impl(module, character);
@@ -109,7 +121,13 @@
     int character;
     int _return_value;
 
-    if (!PyArg_Parse(arg, "i:ascii_tolower", &character)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    character = _PyLong_AsInt(arg);
+    if (character == -1 && PyErr_Occurred()) {
         goto exit;
     }
     _return_value = _sre_ascii_tolower_impl(module, character);
@@ -140,7 +158,13 @@
     int character;
     int _return_value;
 
-    if (!PyArg_Parse(arg, "i:unicode_tolower", &character)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    character = _PyLong_AsInt(arg);
+    if (character == -1 && PyErr_Occurred()) {
         goto exit;
     }
     _return_value = _sre_unicode_tolower_impl(module, character);
@@ -765,4 +789,4 @@
 {
     return _sre_SRE_Scanner_search_impl(self);
 }
-/*[clinic end generated code: output=5edeca5ec36b5f34 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=7992634045212b26 input=a9049054013a1b77]*/
diff --git a/Modules/clinic/_ssl.c.h b/Modules/clinic/_ssl.c.h
index 82dc197..e149077 100644
--- a/Modules/clinic/_ssl.c.h
+++ b/Modules/clinic/_ssl.c.h
@@ -36,7 +36,7 @@
     PyObject *return_value = NULL;
     PyObject *path;
 
-    if (!PyArg_Parse(arg, "O&:_test_decode_cert", PyUnicode_FSConverter, &path)) {
+    if (!PyUnicode_FSConverter(arg, &path)) {
         goto exit;
     }
     return_value = _ssl__test_decode_cert_impl(module, path);
@@ -211,7 +211,11 @@
     PyObject *return_value = NULL;
     Py_buffer b = {NULL, NULL};
 
-    if (!PyArg_Parse(arg, "y*:write", &b)) {
+    if (PyObject_GetBuffer(arg, &b, PyBUF_SIMPLE) != 0) {
+        goto exit;
+    }
+    if (!PyBuffer_IsContiguous(&b, 'C')) {
+        _PyArg_BadArgument("write", "contiguous buffer", arg);
         goto exit;
     }
     return_value = _ssl__SSLSocket_write_impl(self, &b);
@@ -400,7 +404,17 @@
     PyObject *return_value = NULL;
     const char *cipherlist;
 
-    if (!PyArg_Parse(arg, "s:set_ciphers", &cipherlist)) {
+    if (!PyUnicode_Check(arg)) {
+        _PyArg_BadArgument("set_ciphers", "str", arg);
+        goto exit;
+    }
+    Py_ssize_t cipherlist_length;
+    cipherlist = PyUnicode_AsUTF8AndSize(arg, &cipherlist_length);
+    if (cipherlist == NULL) {
+        goto exit;
+    }
+    if (strlen(cipherlist) != (size_t)cipherlist_length) {
+        PyErr_SetString(PyExc_ValueError, "embedded null character");
         goto exit;
     }
     return_value = _ssl__SSLContext_set_ciphers_impl(self, cipherlist);
@@ -448,7 +462,11 @@
     PyObject *return_value = NULL;
     Py_buffer protos = {NULL, NULL};
 
-    if (!PyArg_Parse(arg, "y*:_set_npn_protocols", &protos)) {
+    if (PyObject_GetBuffer(arg, &protos, PyBUF_SIMPLE) != 0) {
+        goto exit;
+    }
+    if (!PyBuffer_IsContiguous(&protos, 'C')) {
+        _PyArg_BadArgument("_set_npn_protocols", "contiguous buffer", arg);
         goto exit;
     }
     return_value = _ssl__SSLContext__set_npn_protocols_impl(self, &protos);
@@ -480,7 +498,11 @@
     PyObject *return_value = NULL;
     Py_buffer protos = {NULL, NULL};
 
-    if (!PyArg_Parse(arg, "y*:_set_alpn_protocols", &protos)) {
+    if (PyObject_GetBuffer(arg, &protos, PyBUF_SIMPLE) != 0) {
+        goto exit;
+    }
+    if (!PyBuffer_IsContiguous(&protos, 'C')) {
+        _PyArg_BadArgument("_set_alpn_protocols", "contiguous buffer", arg);
         goto exit;
     }
     return_value = _ssl__SSLContext__set_alpn_protocols_impl(self, &protos);
@@ -823,7 +845,11 @@
     PyObject *return_value = NULL;
     Py_buffer b = {NULL, NULL};
 
-    if (!PyArg_Parse(arg, "y*:write", &b)) {
+    if (PyObject_GetBuffer(arg, &b, PyBUF_SIMPLE) != 0) {
+        goto exit;
+    }
+    if (!PyBuffer_IsContiguous(&b, 'C')) {
+        _PyArg_BadArgument("write", "contiguous buffer", arg);
         goto exit;
     }
     return_value = _ssl_MemoryBIO_write_impl(self, &b);
@@ -912,7 +938,13 @@
     PyObject *return_value = NULL;
     int n;
 
-    if (!PyArg_Parse(arg, "i:RAND_bytes", &n)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    n = _PyLong_AsInt(arg);
+    if (n == -1 && PyErr_Occurred()) {
         goto exit;
     }
     return_value = _ssl_RAND_bytes_impl(module, n);
@@ -942,7 +974,13 @@
     PyObject *return_value = NULL;
     int n;
 
-    if (!PyArg_Parse(arg, "i:RAND_pseudo_bytes", &n)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    n = _PyLong_AsInt(arg);
+    if (n == -1 && PyErr_Occurred()) {
         goto exit;
     }
     return_value = _ssl_RAND_pseudo_bytes_impl(module, n);
@@ -995,7 +1033,7 @@
     PyObject *return_value = NULL;
     PyObject *path;
 
-    if (!PyArg_Parse(arg, "O&:RAND_egd", PyUnicode_FSConverter, &path)) {
+    if (!PyUnicode_FSConverter(arg, &path)) {
         goto exit;
     }
     return_value = _ssl_RAND_egd_impl(module, path);
@@ -1078,7 +1116,13 @@
     PyObject *return_value = NULL;
     int nid;
 
-    if (!PyArg_Parse(arg, "i:nid2obj", &nid)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    nid = _PyLong_AsInt(arg);
+    if (nid == -1 && PyErr_Occurred()) {
         goto exit;
     }
     return_value = _ssl_nid2obj_impl(module, nid);
@@ -1193,4 +1237,4 @@
 #ifndef _SSL_ENUM_CRLS_METHODDEF
     #define _SSL_ENUM_CRLS_METHODDEF
 #endif /* !defined(_SSL_ENUM_CRLS_METHODDEF) */
-/*[clinic end generated code: output=d87f783224be8fca input=a9049054013a1b77]*/
+/*[clinic end generated code: output=c2dca2ef4cbef4e2 input=a9049054013a1b77]*/
diff --git a/Modules/clinic/_struct.c.h b/Modules/clinic/_struct.c.h
index b1fa067..3a186e4 100644
--- a/Modules/clinic/_struct.c.h
+++ b/Modules/clinic/_struct.c.h
@@ -57,7 +57,11 @@
     PyObject *return_value = NULL;
     Py_buffer buffer = {NULL, NULL};
 
-    if (!PyArg_Parse(arg, "y*:unpack", &buffer)) {
+    if (PyObject_GetBuffer(arg, &buffer, PyBUF_SIMPLE) != 0) {
+        goto exit;
+    }
+    if (!PyBuffer_IsContiguous(&buffer, 'C')) {
+        _PyArg_BadArgument("unpack", "contiguous buffer", arg);
         goto exit;
     }
     return_value = Struct_unpack_impl(self, &buffer);
@@ -166,7 +170,7 @@
     PyStructObject *s_object = NULL;
     Py_ssize_t _return_value;
 
-    if (!PyArg_Parse(arg, "O&:calcsize", cache_struct_converter, &s_object)) {
+    if (!cache_struct_converter(arg, &s_object)) {
         goto exit;
     }
     _return_value = calcsize_impl(module, s_object);
@@ -303,4 +307,4 @@
 
     return return_value;
 }
-/*[clinic end generated code: output=a73b0453174e4b51 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=01516bea2641fe01 input=a9049054013a1b77]*/
diff --git a/Modules/clinic/_tkinter.c.h b/Modules/clinic/_tkinter.c.h
index a09bc2d..1eedd2b 100644
--- a/Modules/clinic/_tkinter.c.h
+++ b/Modules/clinic/_tkinter.c.h
@@ -19,7 +19,17 @@
     PyObject *return_value = NULL;
     const char *script;
 
-    if (!PyArg_Parse(arg, "s:eval", &script)) {
+    if (!PyUnicode_Check(arg)) {
+        _PyArg_BadArgument("eval", "str", arg);
+        goto exit;
+    }
+    Py_ssize_t script_length;
+    script = PyUnicode_AsUTF8AndSize(arg, &script_length);
+    if (script == NULL) {
+        goto exit;
+    }
+    if (strlen(script) != (size_t)script_length) {
+        PyErr_SetString(PyExc_ValueError, "embedded null character");
         goto exit;
     }
     return_value = _tkinter_tkapp_eval_impl(self, script);
@@ -45,7 +55,17 @@
     PyObject *return_value = NULL;
     const char *fileName;
 
-    if (!PyArg_Parse(arg, "s:evalfile", &fileName)) {
+    if (!PyUnicode_Check(arg)) {
+        _PyArg_BadArgument("evalfile", "str", arg);
+        goto exit;
+    }
+    Py_ssize_t fileName_length;
+    fileName = PyUnicode_AsUTF8AndSize(arg, &fileName_length);
+    if (fileName == NULL) {
+        goto exit;
+    }
+    if (strlen(fileName) != (size_t)fileName_length) {
+        PyErr_SetString(PyExc_ValueError, "embedded null character");
         goto exit;
     }
     return_value = _tkinter_tkapp_evalfile_impl(self, fileName);
@@ -71,7 +91,17 @@
     PyObject *return_value = NULL;
     const char *script;
 
-    if (!PyArg_Parse(arg, "s:record", &script)) {
+    if (!PyUnicode_Check(arg)) {
+        _PyArg_BadArgument("record", "str", arg);
+        goto exit;
+    }
+    Py_ssize_t script_length;
+    script = PyUnicode_AsUTF8AndSize(arg, &script_length);
+    if (script == NULL) {
+        goto exit;
+    }
+    if (strlen(script) != (size_t)script_length) {
+        PyErr_SetString(PyExc_ValueError, "embedded null character");
         goto exit;
     }
     return_value = _tkinter_tkapp_record_impl(self, script);
@@ -97,7 +127,17 @@
     PyObject *return_value = NULL;
     const char *msg;
 
-    if (!PyArg_Parse(arg, "s:adderrorinfo", &msg)) {
+    if (!PyUnicode_Check(arg)) {
+        _PyArg_BadArgument("adderrorinfo", "str", arg);
+        goto exit;
+    }
+    Py_ssize_t msg_length;
+    msg = PyUnicode_AsUTF8AndSize(arg, &msg_length);
+    if (msg == NULL) {
+        goto exit;
+    }
+    if (strlen(msg) != (size_t)msg_length) {
+        PyErr_SetString(PyExc_ValueError, "embedded null character");
         goto exit;
     }
     return_value = _tkinter_tkapp_adderrorinfo_impl(self, msg);
@@ -147,7 +187,17 @@
     PyObject *return_value = NULL;
     const char *s;
 
-    if (!PyArg_Parse(arg, "s:exprstring", &s)) {
+    if (!PyUnicode_Check(arg)) {
+        _PyArg_BadArgument("exprstring", "str", arg);
+        goto exit;
+    }
+    Py_ssize_t s_length;
+    s = PyUnicode_AsUTF8AndSize(arg, &s_length);
+    if (s == NULL) {
+        goto exit;
+    }
+    if (strlen(s) != (size_t)s_length) {
+        PyErr_SetString(PyExc_ValueError, "embedded null character");
         goto exit;
     }
     return_value = _tkinter_tkapp_exprstring_impl(self, s);
@@ -173,7 +223,17 @@
     PyObject *return_value = NULL;
     const char *s;
 
-    if (!PyArg_Parse(arg, "s:exprlong", &s)) {
+    if (!PyUnicode_Check(arg)) {
+        _PyArg_BadArgument("exprlong", "str", arg);
+        goto exit;
+    }
+    Py_ssize_t s_length;
+    s = PyUnicode_AsUTF8AndSize(arg, &s_length);
+    if (s == NULL) {
+        goto exit;
+    }
+    if (strlen(s) != (size_t)s_length) {
+        PyErr_SetString(PyExc_ValueError, "embedded null character");
         goto exit;
     }
     return_value = _tkinter_tkapp_exprlong_impl(self, s);
@@ -199,7 +259,17 @@
     PyObject *return_value = NULL;
     const char *s;
 
-    if (!PyArg_Parse(arg, "s:exprdouble", &s)) {
+    if (!PyUnicode_Check(arg)) {
+        _PyArg_BadArgument("exprdouble", "str", arg);
+        goto exit;
+    }
+    Py_ssize_t s_length;
+    s = PyUnicode_AsUTF8AndSize(arg, &s_length);
+    if (s == NULL) {
+        goto exit;
+    }
+    if (strlen(s) != (size_t)s_length) {
+        PyErr_SetString(PyExc_ValueError, "embedded null character");
         goto exit;
     }
     return_value = _tkinter_tkapp_exprdouble_impl(self, s);
@@ -225,7 +295,17 @@
     PyObject *return_value = NULL;
     const char *s;
 
-    if (!PyArg_Parse(arg, "s:exprboolean", &s)) {
+    if (!PyUnicode_Check(arg)) {
+        _PyArg_BadArgument("exprboolean", "str", arg);
+        goto exit;
+    }
+    Py_ssize_t s_length;
+    s = PyUnicode_AsUTF8AndSize(arg, &s_length);
+    if (s == NULL) {
+        goto exit;
+    }
+    if (strlen(s) != (size_t)s_length) {
+        PyErr_SetString(PyExc_ValueError, "embedded null character");
         goto exit;
     }
     return_value = _tkinter_tkapp_exprboolean_impl(self, s);
@@ -296,7 +376,17 @@
     PyObject *return_value = NULL;
     const char *name;
 
-    if (!PyArg_Parse(arg, "s:deletecommand", &name)) {
+    if (!PyUnicode_Check(arg)) {
+        _PyArg_BadArgument("deletecommand", "str", arg);
+        goto exit;
+    }
+    Py_ssize_t name_length;
+    name = PyUnicode_AsUTF8AndSize(arg, &name_length);
+    if (name == NULL) {
+        goto exit;
+    }
+    if (strlen(name) != (size_t)name_length) {
+        PyErr_SetString(PyExc_ValueError, "embedded null character");
         goto exit;
     }
     return_value = _tkinter_tkapp_deletecommand_impl(self, name);
@@ -594,7 +684,13 @@
     PyObject *return_value = NULL;
     int new_val;
 
-    if (!PyArg_Parse(arg, "i:setbusywaitinterval", &new_val)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    new_val = _PyLong_AsInt(arg);
+    if (new_val == -1 && PyErr_Occurred()) {
         goto exit;
     }
     return_value = _tkinter_setbusywaitinterval_impl(module, new_val);
@@ -638,4 +734,4 @@
 #ifndef _TKINTER_TKAPP_DELETEFILEHANDLER_METHODDEF
     #define _TKINTER_TKAPP_DELETEFILEHANDLER_METHODDEF
 #endif /* !defined(_TKINTER_TKAPP_DELETEFILEHANDLER_METHODDEF) */
-/*[clinic end generated code: output=a9d45a90cde94980 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=d84b0e794824c511 input=a9049054013a1b77]*/
diff --git a/Modules/clinic/_winapi.c.h b/Modules/clinic/_winapi.c.h
index 79d85ff..f1158a0 100644
--- a/Modules/clinic/_winapi.c.h
+++ b/Modules/clinic/_winapi.c.h
@@ -19,7 +19,8 @@
     PyObject *return_value = NULL;
     int wait;
 
-    if (!PyArg_Parse(arg, "p:GetOverlappedResult", &wait)) {
+    wait = PyObject_IsTrue(arg);
+    if (wait < 0) {
         goto exit;
     }
     return_value = _winapi_Overlapped_GetOverlappedResult_impl(self, wait);
@@ -944,4 +945,4 @@
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=145d0d362167c1b1 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=5063c84b2d125488 input=a9049054013a1b77]*/
diff --git a/Modules/clinic/arraymodule.c.h b/Modules/clinic/arraymodule.c.h
index 0d10087..eb081ad 100644
--- a/Modules/clinic/arraymodule.c.h
+++ b/Modules/clinic/arraymodule.c.h
@@ -278,8 +278,22 @@
     PyObject *return_value = NULL;
     Py_buffer buffer = {NULL, NULL};
 
-    if (!PyArg_Parse(arg, "s*:fromstring", &buffer)) {
-        goto exit;
+    if (PyUnicode_Check(arg)) {
+        Py_ssize_t len;
+        const char *ptr = PyUnicode_AsUTF8AndSize(arg, &len);
+        if (ptr == NULL) {
+            goto exit;
+        }
+        PyBuffer_FillInfo(&buffer, arg, (void *)ptr, len, 1, 0);
+    }
+    else { /* any bytes-like object */
+        if (PyObject_GetBuffer(arg, &buffer, PyBUF_SIMPLE) != 0) {
+            goto exit;
+        }
+        if (!PyBuffer_IsContiguous(&buffer, 'C')) {
+            _PyArg_BadArgument("fromstring", "contiguous buffer", arg);
+            goto exit;
+        }
     }
     return_value = array_array_fromstring_impl(self, &buffer);
 
@@ -310,7 +324,11 @@
     PyObject *return_value = NULL;
     Py_buffer buffer = {NULL, NULL};
 
-    if (!PyArg_Parse(arg, "y*:frombytes", &buffer)) {
+    if (PyObject_GetBuffer(arg, &buffer, PyBUF_SIMPLE) != 0) {
+        goto exit;
+    }
+    if (!PyBuffer_IsContiguous(&buffer, 'C')) {
+        _PyArg_BadArgument("frombytes", "contiguous buffer", arg);
         goto exit;
     }
     return_value = array_array_frombytes_impl(self, &buffer);
@@ -505,4 +523,4 @@
 
 #define ARRAY_ARRAYITERATOR___SETSTATE___METHODDEF    \
     {"__setstate__", (PyCFunction)array_arrayiterator___setstate__, METH_O, array_arrayiterator___setstate____doc__},
-/*[clinic end generated code: output=3d2bb1aa81541cbd input=a9049054013a1b77]*/
+/*[clinic end generated code: output=15da19d2ece09d22 input=a9049054013a1b77]*/
diff --git a/Modules/clinic/binascii.c.h b/Modules/clinic/binascii.c.h
index 07ab24c..91f261c 100644
--- a/Modules/clinic/binascii.c.h
+++ b/Modules/clinic/binascii.c.h
@@ -20,7 +20,7 @@
     PyObject *return_value = NULL;
     Py_buffer data = {NULL, NULL};
 
-    if (!PyArg_Parse(arg, "O&:a2b_uu", ascii_buffer_converter, &data)) {
+    if (!ascii_buffer_converter(arg, &data)) {
         goto exit;
     }
     return_value = binascii_a2b_uu_impl(module, &data);
@@ -87,7 +87,7 @@
     PyObject *return_value = NULL;
     Py_buffer data = {NULL, NULL};
 
-    if (!PyArg_Parse(arg, "O&:a2b_base64", ascii_buffer_converter, &data)) {
+    if (!ascii_buffer_converter(arg, &data)) {
         goto exit;
     }
     return_value = binascii_a2b_base64_impl(module, &data);
@@ -154,7 +154,7 @@
     PyObject *return_value = NULL;
     Py_buffer data = {NULL, NULL};
 
-    if (!PyArg_Parse(arg, "O&:a2b_hqx", ascii_buffer_converter, &data)) {
+    if (!ascii_buffer_converter(arg, &data)) {
         goto exit;
     }
     return_value = binascii_a2b_hqx_impl(module, &data);
@@ -185,7 +185,11 @@
     PyObject *return_value = NULL;
     Py_buffer data = {NULL, NULL};
 
-    if (!PyArg_Parse(arg, "y*:rlecode_hqx", &data)) {
+    if (PyObject_GetBuffer(arg, &data, PyBUF_SIMPLE) != 0) {
+        goto exit;
+    }
+    if (!PyBuffer_IsContiguous(&data, 'C')) {
+        _PyArg_BadArgument("rlecode_hqx", "contiguous buffer", arg);
         goto exit;
     }
     return_value = binascii_rlecode_hqx_impl(module, &data);
@@ -217,7 +221,11 @@
     PyObject *return_value = NULL;
     Py_buffer data = {NULL, NULL};
 
-    if (!PyArg_Parse(arg, "y*:b2a_hqx", &data)) {
+    if (PyObject_GetBuffer(arg, &data, PyBUF_SIMPLE) != 0) {
+        goto exit;
+    }
+    if (!PyBuffer_IsContiguous(&data, 'C')) {
+        _PyArg_BadArgument("b2a_hqx", "contiguous buffer", arg);
         goto exit;
     }
     return_value = binascii_b2a_hqx_impl(module, &data);
@@ -249,7 +257,11 @@
     PyObject *return_value = NULL;
     Py_buffer data = {NULL, NULL};
 
-    if (!PyArg_Parse(arg, "y*:rledecode_hqx", &data)) {
+    if (PyObject_GetBuffer(arg, &data, PyBUF_SIMPLE) != 0) {
+        goto exit;
+    }
+    if (!PyBuffer_IsContiguous(&data, 'C')) {
+        _PyArg_BadArgument("rledecode_hqx", "contiguous buffer", arg);
         goto exit;
     }
     return_value = binascii_rledecode_hqx_impl(module, &data);
@@ -362,7 +374,11 @@
     PyObject *return_value = NULL;
     Py_buffer data = {NULL, NULL};
 
-    if (!PyArg_Parse(arg, "y*:b2a_hex", &data)) {
+    if (PyObject_GetBuffer(arg, &data, PyBUF_SIMPLE) != 0) {
+        goto exit;
+    }
+    if (!PyBuffer_IsContiguous(&data, 'C')) {
+        _PyArg_BadArgument("b2a_hex", "contiguous buffer", arg);
         goto exit;
     }
     return_value = binascii_b2a_hex_impl(module, &data);
@@ -396,7 +412,11 @@
     PyObject *return_value = NULL;
     Py_buffer data = {NULL, NULL};
 
-    if (!PyArg_Parse(arg, "y*:hexlify", &data)) {
+    if (PyObject_GetBuffer(arg, &data, PyBUF_SIMPLE) != 0) {
+        goto exit;
+    }
+    if (!PyBuffer_IsContiguous(&data, 'C')) {
+        _PyArg_BadArgument("hexlify", "contiguous buffer", arg);
         goto exit;
     }
     return_value = binascii_hexlify_impl(module, &data);
@@ -431,7 +451,7 @@
     PyObject *return_value = NULL;
     Py_buffer hexstr = {NULL, NULL};
 
-    if (!PyArg_Parse(arg, "O&:a2b_hex", ascii_buffer_converter, &hexstr)) {
+    if (!ascii_buffer_converter(arg, &hexstr)) {
         goto exit;
     }
     return_value = binascii_a2b_hex_impl(module, &hexstr);
@@ -464,7 +484,7 @@
     PyObject *return_value = NULL;
     Py_buffer hexstr = {NULL, NULL};
 
-    if (!PyArg_Parse(arg, "O&:unhexlify", ascii_buffer_converter, &hexstr)) {
+    if (!ascii_buffer_converter(arg, &hexstr)) {
         goto exit;
     }
     return_value = binascii_unhexlify_impl(module, &hexstr);
@@ -554,4 +574,4 @@
 
     return return_value;
 }
-/*[clinic end generated code: output=3f45e15ce8b563b7 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=8ff0cb5717b15d1b input=a9049054013a1b77]*/
diff --git a/Modules/clinic/cmathmodule.c.h b/Modules/clinic/cmathmodule.c.h
index 021c87d..30378c7 100644
--- a/Modules/clinic/cmathmodule.c.h
+++ b/Modules/clinic/cmathmodule.c.h
@@ -21,7 +21,8 @@
     Py_complex z;
     Py_complex _return_value;
 
-    if (!PyArg_Parse(arg, "D:acos", &z)) {
+    z = PyComplex_AsCComplex(arg);
+    if (PyErr_Occurred()) {
         goto exit;
     }
     /* modifications for z */
@@ -63,7 +64,8 @@
     Py_complex z;
     Py_complex _return_value;
 
-    if (!PyArg_Parse(arg, "D:acosh", &z)) {
+    z = PyComplex_AsCComplex(arg);
+    if (PyErr_Occurred()) {
         goto exit;
     }
     /* modifications for z */
@@ -105,7 +107,8 @@
     Py_complex z;
     Py_complex _return_value;
 
-    if (!PyArg_Parse(arg, "D:asin", &z)) {
+    z = PyComplex_AsCComplex(arg);
+    if (PyErr_Occurred()) {
         goto exit;
     }
     /* modifications for z */
@@ -147,7 +150,8 @@
     Py_complex z;
     Py_complex _return_value;
 
-    if (!PyArg_Parse(arg, "D:asinh", &z)) {
+    z = PyComplex_AsCComplex(arg);
+    if (PyErr_Occurred()) {
         goto exit;
     }
     /* modifications for z */
@@ -189,7 +193,8 @@
     Py_complex z;
     Py_complex _return_value;
 
-    if (!PyArg_Parse(arg, "D:atan", &z)) {
+    z = PyComplex_AsCComplex(arg);
+    if (PyErr_Occurred()) {
         goto exit;
     }
     /* modifications for z */
@@ -231,7 +236,8 @@
     Py_complex z;
     Py_complex _return_value;
 
-    if (!PyArg_Parse(arg, "D:atanh", &z)) {
+    z = PyComplex_AsCComplex(arg);
+    if (PyErr_Occurred()) {
         goto exit;
     }
     /* modifications for z */
@@ -273,7 +279,8 @@
     Py_complex z;
     Py_complex _return_value;
 
-    if (!PyArg_Parse(arg, "D:cos", &z)) {
+    z = PyComplex_AsCComplex(arg);
+    if (PyErr_Occurred()) {
         goto exit;
     }
     /* modifications for z */
@@ -315,7 +322,8 @@
     Py_complex z;
     Py_complex _return_value;
 
-    if (!PyArg_Parse(arg, "D:cosh", &z)) {
+    z = PyComplex_AsCComplex(arg);
+    if (PyErr_Occurred()) {
         goto exit;
     }
     /* modifications for z */
@@ -357,7 +365,8 @@
     Py_complex z;
     Py_complex _return_value;
 
-    if (!PyArg_Parse(arg, "D:exp", &z)) {
+    z = PyComplex_AsCComplex(arg);
+    if (PyErr_Occurred()) {
         goto exit;
     }
     /* modifications for z */
@@ -399,7 +408,8 @@
     Py_complex z;
     Py_complex _return_value;
 
-    if (!PyArg_Parse(arg, "D:log10", &z)) {
+    z = PyComplex_AsCComplex(arg);
+    if (PyErr_Occurred()) {
         goto exit;
     }
     /* modifications for z */
@@ -441,7 +451,8 @@
     Py_complex z;
     Py_complex _return_value;
 
-    if (!PyArg_Parse(arg, "D:sin", &z)) {
+    z = PyComplex_AsCComplex(arg);
+    if (PyErr_Occurred()) {
         goto exit;
     }
     /* modifications for z */
@@ -483,7 +494,8 @@
     Py_complex z;
     Py_complex _return_value;
 
-    if (!PyArg_Parse(arg, "D:sinh", &z)) {
+    z = PyComplex_AsCComplex(arg);
+    if (PyErr_Occurred()) {
         goto exit;
     }
     /* modifications for z */
@@ -525,7 +537,8 @@
     Py_complex z;
     Py_complex _return_value;
 
-    if (!PyArg_Parse(arg, "D:sqrt", &z)) {
+    z = PyComplex_AsCComplex(arg);
+    if (PyErr_Occurred()) {
         goto exit;
     }
     /* modifications for z */
@@ -567,7 +580,8 @@
     Py_complex z;
     Py_complex _return_value;
 
-    if (!PyArg_Parse(arg, "D:tan", &z)) {
+    z = PyComplex_AsCComplex(arg);
+    if (PyErr_Occurred()) {
         goto exit;
     }
     /* modifications for z */
@@ -609,7 +623,8 @@
     Py_complex z;
     Py_complex _return_value;
 
-    if (!PyArg_Parse(arg, "D:tanh", &z)) {
+    z = PyComplex_AsCComplex(arg);
+    if (PyErr_Occurred()) {
         goto exit;
     }
     /* modifications for z */
@@ -681,7 +696,8 @@
     PyObject *return_value = NULL;
     Py_complex z;
 
-    if (!PyArg_Parse(arg, "D:phase", &z)) {
+    z = PyComplex_AsCComplex(arg);
+    if (PyErr_Occurred()) {
         goto exit;
     }
     return_value = cmath_phase_impl(module, z);
@@ -710,7 +726,8 @@
     PyObject *return_value = NULL;
     Py_complex z;
 
-    if (!PyArg_Parse(arg, "D:polar", &z)) {
+    z = PyComplex_AsCComplex(arg);
+    if (PyErr_Occurred()) {
         goto exit;
     }
     return_value = cmath_polar_impl(module, z);
@@ -766,7 +783,8 @@
     PyObject *return_value = NULL;
     Py_complex z;
 
-    if (!PyArg_Parse(arg, "D:isfinite", &z)) {
+    z = PyComplex_AsCComplex(arg);
+    if (PyErr_Occurred()) {
         goto exit;
     }
     return_value = cmath_isfinite_impl(module, z);
@@ -793,7 +811,8 @@
     PyObject *return_value = NULL;
     Py_complex z;
 
-    if (!PyArg_Parse(arg, "D:isnan", &z)) {
+    z = PyComplex_AsCComplex(arg);
+    if (PyErr_Occurred()) {
         goto exit;
     }
     return_value = cmath_isnan_impl(module, z);
@@ -820,7 +839,8 @@
     PyObject *return_value = NULL;
     Py_complex z;
 
-    if (!PyArg_Parse(arg, "D:isinf", &z)) {
+    z = PyComplex_AsCComplex(arg);
+    if (PyErr_Occurred()) {
         goto exit;
     }
     return_value = cmath_isinf_impl(module, z);
@@ -882,4 +902,4 @@
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=17f6f65a229b1ef9 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=50a105aa2bc5308f input=a9049054013a1b77]*/
diff --git a/Modules/clinic/gcmodule.c.h b/Modules/clinic/gcmodule.c.h
index 1c4be66..4fd2ea0 100644
--- a/Modules/clinic/gcmodule.c.h
+++ b/Modules/clinic/gcmodule.c.h
@@ -136,7 +136,13 @@
     PyObject *return_value = NULL;
     int flags;
 
-    if (!PyArg_Parse(arg, "i:set_debug", &flags)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    flags = _PyLong_AsInt(arg);
+    if (flags == -1 && PyErr_Occurred()) {
         goto exit;
     }
     return_value = gc_set_debug_impl(module, flags);
@@ -325,4 +331,4 @@
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=ba67a1ab58780485 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=5aa5fdc259503d5f input=a9049054013a1b77]*/
diff --git a/Modules/clinic/mathmodule.c.h b/Modules/clinic/mathmodule.c.h
index c8d8029..e436f59 100644
--- a/Modules/clinic/mathmodule.c.h
+++ b/Modules/clinic/mathmodule.c.h
@@ -108,7 +108,8 @@
     PyObject *return_value = NULL;
     double x;
 
-    if (!PyArg_Parse(arg, "d:frexp", &x)) {
+    x = PyFloat_AsDouble(arg);
+    if (PyErr_Occurred()) {
         goto exit;
     }
     return_value = math_frexp_impl(module, x);
@@ -168,7 +169,8 @@
     PyObject *return_value = NULL;
     double x;
 
-    if (!PyArg_Parse(arg, "d:modf", &x)) {
+    x = PyFloat_AsDouble(arg);
+    if (PyErr_Occurred()) {
         goto exit;
     }
     return_value = math_modf_impl(module, x);
@@ -352,7 +354,8 @@
     PyObject *return_value = NULL;
     double x;
 
-    if (!PyArg_Parse(arg, "d:degrees", &x)) {
+    x = PyFloat_AsDouble(arg);
+    if (PyErr_Occurred()) {
         goto exit;
     }
     return_value = math_degrees_impl(module, x);
@@ -379,7 +382,8 @@
     PyObject *return_value = NULL;
     double x;
 
-    if (!PyArg_Parse(arg, "d:radians", &x)) {
+    x = PyFloat_AsDouble(arg);
+    if (PyErr_Occurred()) {
         goto exit;
     }
     return_value = math_radians_impl(module, x);
@@ -406,7 +410,8 @@
     PyObject *return_value = NULL;
     double x;
 
-    if (!PyArg_Parse(arg, "d:isfinite", &x)) {
+    x = PyFloat_AsDouble(arg);
+    if (PyErr_Occurred()) {
         goto exit;
     }
     return_value = math_isfinite_impl(module, x);
@@ -433,7 +438,8 @@
     PyObject *return_value = NULL;
     double x;
 
-    if (!PyArg_Parse(arg, "d:isnan", &x)) {
+    x = PyFloat_AsDouble(arg);
+    if (PyErr_Occurred()) {
         goto exit;
     }
     return_value = math_isnan_impl(module, x);
@@ -460,7 +466,8 @@
     PyObject *return_value = NULL;
     double x;
 
-    if (!PyArg_Parse(arg, "d:isinf", &x)) {
+    x = PyFloat_AsDouble(arg);
+    if (PyErr_Occurred()) {
         goto exit;
     }
     return_value = math_isinf_impl(module, x);
@@ -523,4 +530,4 @@
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=8b1709a71e5fb855 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=da4b9940a5cb0188 input=a9049054013a1b77]*/
diff --git a/Modules/clinic/posixmodule.c.h b/Modules/clinic/posixmodule.c.h
index eabfcf7..e310d99 100644
--- a/Modules/clinic/posixmodule.c.h
+++ b/Modules/clinic/posixmodule.c.h
@@ -185,7 +185,13 @@
     PyObject *return_value = NULL;
     int fd;
 
-    if (!PyArg_Parse(arg, "i:ttyname", &fd)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    fd = _PyLong_AsInt(arg);
+    if (fd == -1 && PyErr_Occurred()) {
         goto exit;
     }
     return_value = os_ttyname_impl(module, fd);
@@ -941,7 +947,7 @@
     PyObject *return_value = NULL;
     path_t path = PATH_T_INITIALIZE("_getfullpathname", "path", 0, 0);
 
-    if (!PyArg_Parse(arg, "O&:_getfullpathname", path_converter, &path)) {
+    if (!path_converter(arg, &path)) {
         goto exit;
     }
     return_value = os__getfullpathname_impl(module, &path);
@@ -975,7 +981,7 @@
     PyObject *return_value = NULL;
     path_t path = PATH_T_INITIALIZE("_getfinalpathname", "path", 0, 0);
 
-    if (!PyArg_Parse(arg, "O&:_getfinalpathname", path_converter, &path)) {
+    if (!path_converter(arg, &path)) {
         goto exit;
     }
     return_value = os__getfinalpathname_impl(module, &path);
@@ -1101,7 +1107,13 @@
     PyObject *return_value = NULL;
     int increment;
 
-    if (!PyArg_Parse(arg, "i:nice", &increment)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    increment = _PyLong_AsInt(arg);
+    if (increment == -1 && PyErr_Occurred()) {
         goto exit;
     }
     return_value = os_nice_impl(module, increment);
@@ -1411,7 +1423,13 @@
     PyObject *return_value = NULL;
     int mask;
 
-    if (!PyArg_Parse(arg, "i:umask", &mask)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    mask = _PyLong_AsInt(arg);
+    if (mask == -1 && PyErr_Occurred()) {
         goto exit;
     }
     return_value = os_umask_impl(module, mask);
@@ -2725,7 +2743,13 @@
     PyObject *return_value = NULL;
     int op;
 
-    if (!PyArg_Parse(arg, "i:plock", &op)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    op = _PyLong_AsInt(arg);
+    if (op == -1 && PyErr_Occurred()) {
         goto exit;
     }
     return_value = os_plock_impl(module, op);
@@ -2756,7 +2780,7 @@
     PyObject *return_value = NULL;
     uid_t uid;
 
-    if (!PyArg_Parse(arg, "O&:setuid", _Py_Uid_Converter, &uid)) {
+    if (!_Py_Uid_Converter(arg, &uid)) {
         goto exit;
     }
     return_value = os_setuid_impl(module, uid);
@@ -2787,7 +2811,7 @@
     PyObject *return_value = NULL;
     uid_t euid;
 
-    if (!PyArg_Parse(arg, "O&:seteuid", _Py_Uid_Converter, &euid)) {
+    if (!_Py_Uid_Converter(arg, &euid)) {
         goto exit;
     }
     return_value = os_seteuid_impl(module, euid);
@@ -2818,7 +2842,7 @@
     PyObject *return_value = NULL;
     gid_t egid;
 
-    if (!PyArg_Parse(arg, "O&:setegid", _Py_Gid_Converter, &egid)) {
+    if (!_Py_Gid_Converter(arg, &egid)) {
         goto exit;
     }
     return_value = os_setegid_impl(module, egid);
@@ -2915,7 +2939,7 @@
     PyObject *return_value = NULL;
     gid_t gid;
 
-    if (!PyArg_Parse(arg, "O&:setgid", _Py_Gid_Converter, &gid)) {
+    if (!_Py_Gid_Converter(arg, &gid)) {
         goto exit;
     }
     return_value = os_setgid_impl(module, gid);
@@ -3389,7 +3413,13 @@
     PyObject *return_value = NULL;
     int fd;
 
-    if (!PyArg_Parse(arg, "i:tcgetpgrp", &fd)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    fd = _PyLong_AsInt(arg);
+    if (fd == -1 && PyErr_Occurred()) {
         goto exit;
     }
     return_value = os_tcgetpgrp_impl(module, fd);
@@ -3557,7 +3587,13 @@
     int fd;
     int _return_value;
 
-    if (!PyArg_Parse(arg, "i:dup", &fd)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    fd = _PyLong_AsInt(arg);
+    if (fd == -1 && PyErr_Occurred()) {
         goto exit;
     }
     _return_value = os_dup_impl(module, fd);
@@ -3981,7 +4017,13 @@
     int fd;
     int _return_value;
 
-    if (!PyArg_Parse(arg, "i:isatty", &fd)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    fd = _PyLong_AsInt(arg);
+    if (fd == -1 && PyErr_Occurred()) {
         goto exit;
     }
     _return_value = os_isatty_impl(module, fd);
@@ -4045,7 +4087,13 @@
     PyObject *return_value = NULL;
     int flags;
 
-    if (!PyArg_Parse(arg, "i:pipe2", &flags)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    flags = _PyLong_AsInt(arg);
+    if (flags == -1 && PyErr_Occurred()) {
         goto exit;
     }
     return_value = os_pipe2_impl(module, flags);
@@ -4318,7 +4366,7 @@
     dev_t device;
     unsigned int _return_value;
 
-    if (!PyArg_Parse(arg, "O&:major", _Py_Dev_Converter, &device)) {
+    if (!_Py_Dev_Converter(arg, &device)) {
         goto exit;
     }
     _return_value = os_major_impl(module, device);
@@ -4354,7 +4402,7 @@
     dev_t device;
     unsigned int _return_value;
 
-    if (!PyArg_Parse(arg, "O&:minor", _Py_Dev_Converter, &device)) {
+    if (!_Py_Dev_Converter(arg, &device)) {
         goto exit;
     }
     _return_value = os_minor_impl(module, device);
@@ -4654,7 +4702,7 @@
     PyObject *return_value = NULL;
     PyObject *name = NULL;
 
-    if (!PyArg_Parse(arg, "O&:unsetenv", PyUnicode_FSConverter, &name)) {
+    if (!PyUnicode_FSConverter(arg, &name)) {
         goto exit;
     }
     return_value = os_unsetenv_impl(module, name);
@@ -4686,7 +4734,13 @@
     PyObject *return_value = NULL;
     int code;
 
-    if (!PyArg_Parse(arg, "i:strerror", &code)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    code = _PyLong_AsInt(arg);
+    if (code == -1 && PyErr_Occurred()) {
         goto exit;
     }
     return_value = os_strerror_impl(module, code);
@@ -4716,7 +4770,13 @@
     int status;
     int _return_value;
 
-    if (!PyArg_Parse(arg, "i:WCOREDUMP", &status)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    status = _PyLong_AsInt(arg);
+    if (status == -1 && PyErr_Occurred()) {
         goto exit;
     }
     _return_value = os_WCOREDUMP_impl(module, status);
@@ -5029,7 +5089,13 @@
     PyObject *return_value = NULL;
     int fd;
 
-    if (!PyArg_Parse(arg, "i:fstatvfs", &fd)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    fd = _PyLong_AsInt(arg);
+    if (fd == -1 && PyErr_Occurred()) {
         goto exit;
     }
     return_value = os_fstatvfs_impl(module, fd);
@@ -5225,7 +5291,7 @@
     PyObject *return_value = NULL;
     int name;
 
-    if (!PyArg_Parse(arg, "O&:confstr", conv_confstr_confname, &name)) {
+    if (!conv_confstr_confname(arg, &name)) {
         goto exit;
     }
     return_value = os_confstr_impl(module, name);
@@ -5257,7 +5323,7 @@
     int name;
     long _return_value;
 
-    if (!PyArg_Parse(arg, "O&:sysconf", conv_sysconf_confname, &name)) {
+    if (!conv_sysconf_confname(arg, &name)) {
         goto exit;
     }
     _return_value = os_sysconf_impl(module, name);
@@ -5730,9 +5796,23 @@
     PyObject *return_value = NULL;
     Py_ssize_t size;
 
-    if (!PyArg_Parse(arg, "n:urandom", &size)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
         goto exit;
     }
+    {
+        Py_ssize_t ival = -1;
+        PyObject *iobj = PyNumber_Index(arg);
+        if (iobj != NULL) {
+            ival = PyLong_AsSsize_t(iobj);
+            Py_DECREF(iobj);
+        }
+        if (ival == -1 && PyErr_Occurred()) {
+            goto exit;
+        }
+        size = ival;
+    }
     return_value = os_urandom_impl(module, size);
 
 exit:
@@ -5780,7 +5860,13 @@
     int fd;
     int _return_value;
 
-    if (!PyArg_Parse(arg, "i:get_inheritable", &fd)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    fd = _PyLong_AsInt(arg);
+    if (fd == -1 && PyErr_Occurred()) {
         goto exit;
     }
     _return_value = os_get_inheritable_impl(module, fd);
@@ -5915,7 +6001,13 @@
     int fd;
     int _return_value;
 
-    if (!PyArg_Parse(arg, "i:get_blocking", &fd)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    fd = _PyLong_AsInt(arg);
+    if (fd == -1 && PyErr_Occurred()) {
         goto exit;
     }
     _return_value = os_get_blocking_impl(module, fd);
@@ -6753,4 +6845,4 @@
 #ifndef OS_GETRANDOM_METHODDEF
     #define OS_GETRANDOM_METHODDEF
 #endif /* !defined(OS_GETRANDOM_METHODDEF) */
-/*[clinic end generated code: output=87a3ebadb91bc46b input=a9049054013a1b77]*/
+/*[clinic end generated code: output=b02036b2a269b1db input=a9049054013a1b77]*/
diff --git a/Modules/clinic/pwdmodule.c.h b/Modules/clinic/pwdmodule.c.h
index 979dfdb..9270be0 100644
--- a/Modules/clinic/pwdmodule.c.h
+++ b/Modules/clinic/pwdmodule.c.h
@@ -33,9 +33,14 @@
     PyObject *return_value = NULL;
     PyObject *name;
 
-    if (!PyArg_Parse(arg, "U:getpwnam", &name)) {
+    if (!PyUnicode_Check(arg)) {
+        _PyArg_BadArgument("getpwnam", "str", arg);
         goto exit;
     }
+    if (PyUnicode_READY(arg) == -1) {
+        goto exit;
+    }
+    name = arg;
     return_value = pwd_getpwnam_impl(module, name);
 
 exit:
@@ -69,4 +74,4 @@
 #ifndef PWD_GETPWALL_METHODDEF
     #define PWD_GETPWALL_METHODDEF
 #endif /* !defined(PWD_GETPWALL_METHODDEF) */
-/*[clinic end generated code: output=3c93120d6dd86905 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=9e86e23d6ad9cd08 input=a9049054013a1b77]*/
diff --git a/Modules/clinic/pyexpat.c.h b/Modules/clinic/pyexpat.c.h
index 5e6db44..1545485 100644
--- a/Modules/clinic/pyexpat.c.h
+++ b/Modules/clinic/pyexpat.c.h
@@ -61,7 +61,17 @@
     PyObject *return_value = NULL;
     const char *base;
 
-    if (!PyArg_Parse(arg, "s:SetBase", &base)) {
+    if (!PyUnicode_Check(arg)) {
+        _PyArg_BadArgument("SetBase", "str", arg);
+        goto exit;
+    }
+    Py_ssize_t base_length;
+    base = PyUnicode_AsUTF8AndSize(arg, &base_length);
+    if (base == NULL) {
+        goto exit;
+    }
+    if (strlen(base) != (size_t)base_length) {
+        PyErr_SetString(PyExc_ValueError, "embedded null character");
         goto exit;
     }
     return_value = pyexpat_xmlparser_SetBase_impl(self, base);
@@ -163,7 +173,13 @@
     PyObject *return_value = NULL;
     int flag;
 
-    if (!PyArg_Parse(arg, "i:SetParamEntityParsing", &flag)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    flag = _PyLong_AsInt(arg);
+    if (flag == -1 && PyErr_Occurred()) {
         goto exit;
     }
     return_value = pyexpat_xmlparser_SetParamEntityParsing_impl(self, flag);
@@ -260,7 +276,13 @@
     PyObject *return_value = NULL;
     long code;
 
-    if (!PyArg_Parse(arg, "l:ErrorString", &code)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    code = PyLong_AsLong(arg);
+    if (code == -1 && PyErr_Occurred()) {
         goto exit;
     }
     return_value = pyexpat_ErrorString_impl(module, code);
@@ -272,4 +294,4 @@
 #ifndef PYEXPAT_XMLPARSER_USEFOREIGNDTD_METHODDEF
     #define PYEXPAT_XMLPARSER_USEFOREIGNDTD_METHODDEF
 #endif /* !defined(PYEXPAT_XMLPARSER_USEFOREIGNDTD_METHODDEF) */
-/*[clinic end generated code: output=c390207761c679d3 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=d3750256eb0da1cb input=a9049054013a1b77]*/
diff --git a/Modules/clinic/resource.c.h b/Modules/clinic/resource.c.h
index cd9fae1..0a66f8f 100644
--- a/Modules/clinic/resource.c.h
+++ b/Modules/clinic/resource.c.h
@@ -19,7 +19,13 @@
     PyObject *return_value = NULL;
     int who;
 
-    if (!PyArg_Parse(arg, "i:getrusage", &who)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    who = _PyLong_AsInt(arg);
+    if (who == -1 && PyErr_Occurred()) {
         goto exit;
     }
     return_value = resource_getrusage_impl(module, who);
@@ -45,7 +51,13 @@
     PyObject *return_value = NULL;
     int resource;
 
-    if (!PyArg_Parse(arg, "i:getrlimit", &resource)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    resource = _PyLong_AsInt(arg);
+    if (resource == -1 && PyErr_Occurred()) {
         goto exit;
     }
     return_value = resource_getrlimit_impl(module, resource);
@@ -157,4 +169,4 @@
 #ifndef RESOURCE_PRLIMIT_METHODDEF
     #define RESOURCE_PRLIMIT_METHODDEF
 #endif /* !defined(RESOURCE_PRLIMIT_METHODDEF) */
-/*[clinic end generated code: output=637ed2c42bde5ca6 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=b16a9149639081fd input=a9049054013a1b77]*/
diff --git a/Modules/clinic/selectmodule.c.h b/Modules/clinic/selectmodule.c.h
index 0a53ae2..bb69d95 100644
--- a/Modules/clinic/selectmodule.c.h
+++ b/Modules/clinic/selectmodule.c.h
@@ -153,7 +153,7 @@
     PyObject *return_value = NULL;
     int fd;
 
-    if (!PyArg_Parse(arg, "O&:unregister", fildes_converter, &fd)) {
+    if (!fildes_converter(arg, &fd)) {
         goto exit;
     }
     return_value = select_poll_unregister_impl(self, fd);
@@ -300,7 +300,7 @@
     PyObject *return_value = NULL;
     int fd;
 
-    if (!PyArg_Parse(arg, "O&:unregister", fildes_converter, &fd)) {
+    if (!fildes_converter(arg, &fd)) {
         goto exit;
     }
     return_value = select_devpoll_unregister_impl(self, fd);
@@ -550,7 +550,13 @@
     PyObject *return_value = NULL;
     int fd;
 
-    if (!PyArg_Parse(arg, "i:fromfd", &fd)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    fd = _PyLong_AsInt(arg);
+    if (fd == -1 && PyErr_Occurred()) {
         goto exit;
     }
     return_value = select_epoll_fromfd_impl(type, fd);
@@ -893,7 +899,13 @@
     PyObject *return_value = NULL;
     int fd;
 
-    if (!PyArg_Parse(arg, "i:fromfd", &fd)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    fd = _PyLong_AsInt(arg);
+    if (fd == -1 && PyErr_Occurred()) {
         goto exit;
     }
     return_value = select_kqueue_fromfd_impl(type, fd);
@@ -1047,4 +1059,4 @@
 #ifndef SELECT_KQUEUE_CONTROL_METHODDEF
     #define SELECT_KQUEUE_CONTROL_METHODDEF
 #endif /* !defined(SELECT_KQUEUE_CONTROL_METHODDEF) */
-/*[clinic end generated code: output=04c4019eb5a4d464 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=122a49f131cdd9d9 input=a9049054013a1b77]*/
diff --git a/Modules/clinic/signalmodule.c.h b/Modules/clinic/signalmodule.c.h
index 912f989..6745f45 100644
--- a/Modules/clinic/signalmodule.c.h
+++ b/Modules/clinic/signalmodule.c.h
@@ -23,7 +23,13 @@
     int seconds;
     long _return_value;
 
-    if (!PyArg_Parse(arg, "i:alarm", &seconds)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    seconds = _PyLong_AsInt(arg);
+    if (seconds == -1 && PyErr_Occurred()) {
         goto exit;
     }
     _return_value = signal_alarm_impl(module, seconds);
@@ -120,7 +126,13 @@
     PyObject *return_value = NULL;
     int signalnum;
 
-    if (!PyArg_Parse(arg, "i:getsignal", &signalnum)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    signalnum = _PyLong_AsInt(arg);
+    if (signalnum == -1 && PyErr_Occurred()) {
         goto exit;
     }
     return_value = signal_getsignal_impl(module, signalnum);
@@ -150,7 +162,13 @@
     PyObject *return_value = NULL;
     int signalnum;
 
-    if (!PyArg_Parse(arg, "i:strsignal", &signalnum)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    signalnum = _PyLong_AsInt(arg);
+    if (signalnum == -1 && PyErr_Occurred()) {
         goto exit;
     }
     return_value = signal_strsignal_impl(module, signalnum);
@@ -255,7 +273,13 @@
     PyObject *return_value = NULL;
     int which;
 
-    if (!PyArg_Parse(arg, "i:getitimer", &which)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    which = _PyLong_AsInt(arg);
+    if (which == -1 && PyErr_Occurred()) {
         goto exit;
     }
     return_value = signal_getitimer_impl(module, which);
@@ -348,7 +372,7 @@
     PyObject *return_value = NULL;
     sigset_t sigset;
 
-    if (!PyArg_Parse(arg, "O&:sigwait", _Py_Sigset_Converter, &sigset)) {
+    if (!_Py_Sigset_Converter(arg, &sigset)) {
         goto exit;
     }
     return_value = signal_sigwait_impl(module, sigset);
@@ -406,7 +430,7 @@
     PyObject *return_value = NULL;
     sigset_t sigset;
 
-    if (!PyArg_Parse(arg, "O&:sigwaitinfo", _Py_Sigset_Converter, &sigset)) {
+    if (!_Py_Sigset_Converter(arg, &sigset)) {
         goto exit;
     }
     return_value = signal_sigwaitinfo_impl(module, sigset);
@@ -534,4 +558,4 @@
 #ifndef SIGNAL_PTHREAD_KILL_METHODDEF
     #define SIGNAL_PTHREAD_KILL_METHODDEF
 #endif /* !defined(SIGNAL_PTHREAD_KILL_METHODDEF) */
-/*[clinic end generated code: output=fa0040750f4c1fcb input=a9049054013a1b77]*/
+/*[clinic end generated code: output=4ed8c36860f9f577 input=a9049054013a1b77]*/
diff --git a/Modules/clinic/spwdmodule.c.h b/Modules/clinic/spwdmodule.c.h
index b2479ff..a0a3e2e 100644
--- a/Modules/clinic/spwdmodule.c.h
+++ b/Modules/clinic/spwdmodule.c.h
@@ -24,9 +24,14 @@
     PyObject *return_value = NULL;
     PyObject *arg;
 
-    if (!PyArg_Parse(arg_, "U:getspnam", &arg)) {
+    if (!PyUnicode_Check(arg_)) {
+        _PyArg_BadArgument("getspnam", "str", arg_);
         goto exit;
     }
+    if (PyUnicode_READY(arg_) == -1) {
+        goto exit;
+    }
+    arg = arg_;
     return_value = spwd_getspnam_impl(module, arg);
 
 exit:
@@ -66,4 +71,4 @@
 #ifndef SPWD_GETSPALL_METHODDEF
     #define SPWD_GETSPALL_METHODDEF
 #endif /* !defined(SPWD_GETSPALL_METHODDEF) */
-/*[clinic end generated code: output=07cd8af0afd77fe7 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=44a7c196d4b48f4e input=a9049054013a1b77]*/
diff --git a/Modules/clinic/unicodedata.c.h b/Modules/clinic/unicodedata.c.h
index 4799fb4..9e8d261 100644
--- a/Modules/clinic/unicodedata.c.h
+++ b/Modules/clinic/unicodedata.c.h
@@ -121,9 +121,18 @@
     PyObject *return_value = NULL;
     int chr;
 
-    if (!PyArg_Parse(arg, "C:category", &chr)) {
+    if (!PyUnicode_Check(arg)) {
+        _PyArg_BadArgument("category", "a unicode character", arg);
         goto exit;
     }
+    if (PyUnicode_READY(arg)) {
+        goto exit;
+    }
+    if (PyUnicode_GET_LENGTH(arg) != 1) {
+        _PyArg_BadArgument("category", "a unicode character", arg);
+        goto exit;
+    }
+    chr = PyUnicode_READ_CHAR(arg, 0);
     return_value = unicodedata_UCD_category_impl(self, chr);
 
 exit:
@@ -150,9 +159,18 @@
     PyObject *return_value = NULL;
     int chr;
 
-    if (!PyArg_Parse(arg, "C:bidirectional", &chr)) {
+    if (!PyUnicode_Check(arg)) {
+        _PyArg_BadArgument("bidirectional", "a unicode character", arg);
         goto exit;
     }
+    if (PyUnicode_READY(arg)) {
+        goto exit;
+    }
+    if (PyUnicode_GET_LENGTH(arg) != 1) {
+        _PyArg_BadArgument("bidirectional", "a unicode character", arg);
+        goto exit;
+    }
+    chr = PyUnicode_READ_CHAR(arg, 0);
     return_value = unicodedata_UCD_bidirectional_impl(self, chr);
 
 exit:
@@ -180,9 +198,18 @@
     int chr;
     int _return_value;
 
-    if (!PyArg_Parse(arg, "C:combining", &chr)) {
+    if (!PyUnicode_Check(arg)) {
+        _PyArg_BadArgument("combining", "a unicode character", arg);
         goto exit;
     }
+    if (PyUnicode_READY(arg)) {
+        goto exit;
+    }
+    if (PyUnicode_GET_LENGTH(arg) != 1) {
+        _PyArg_BadArgument("combining", "a unicode character", arg);
+        goto exit;
+    }
+    chr = PyUnicode_READ_CHAR(arg, 0);
     _return_value = unicodedata_UCD_combining_impl(self, chr);
     if ((_return_value == -1) && PyErr_Occurred()) {
         goto exit;
@@ -215,9 +242,18 @@
     int chr;
     int _return_value;
 
-    if (!PyArg_Parse(arg, "C:mirrored", &chr)) {
+    if (!PyUnicode_Check(arg)) {
+        _PyArg_BadArgument("mirrored", "a unicode character", arg);
         goto exit;
     }
+    if (PyUnicode_READY(arg)) {
+        goto exit;
+    }
+    if (PyUnicode_GET_LENGTH(arg) != 1) {
+        _PyArg_BadArgument("mirrored", "a unicode character", arg);
+        goto exit;
+    }
+    chr = PyUnicode_READ_CHAR(arg, 0);
     _return_value = unicodedata_UCD_mirrored_impl(self, chr);
     if ((_return_value == -1) && PyErr_Occurred()) {
         goto exit;
@@ -246,9 +282,18 @@
     PyObject *return_value = NULL;
     int chr;
 
-    if (!PyArg_Parse(arg, "C:east_asian_width", &chr)) {
+    if (!PyUnicode_Check(arg)) {
+        _PyArg_BadArgument("east_asian_width", "a unicode character", arg);
         goto exit;
     }
+    if (PyUnicode_READY(arg)) {
+        goto exit;
+    }
+    if (PyUnicode_GET_LENGTH(arg) != 1) {
+        _PyArg_BadArgument("east_asian_width", "a unicode character", arg);
+        goto exit;
+    }
+    chr = PyUnicode_READ_CHAR(arg, 0);
     return_value = unicodedata_UCD_east_asian_width_impl(self, chr);
 
 exit:
@@ -275,9 +320,18 @@
     PyObject *return_value = NULL;
     int chr;
 
-    if (!PyArg_Parse(arg, "C:decomposition", &chr)) {
+    if (!PyUnicode_Check(arg)) {
+        _PyArg_BadArgument("decomposition", "a unicode character", arg);
         goto exit;
     }
+    if (PyUnicode_READY(arg)) {
+        goto exit;
+    }
+    if (PyUnicode_GET_LENGTH(arg) != 1) {
+        _PyArg_BadArgument("decomposition", "a unicode character", arg);
+        goto exit;
+    }
+    chr = PyUnicode_READ_CHAR(arg, 0);
     return_value = unicodedata_UCD_decomposition_impl(self, chr);
 
 exit:
@@ -411,4 +465,4 @@
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=67f474927be668bf input=a9049054013a1b77]*/
+/*[clinic end generated code: output=709241b99d010896 input=a9049054013a1b77]*/
diff --git a/Modules/clinic/zlibmodule.c.h b/Modules/clinic/zlibmodule.c.h
index c5eeab7..87ad1ea 100644
--- a/Modules/clinic/zlibmodule.c.h
+++ b/Modules/clinic/zlibmodule.c.h
@@ -215,7 +215,11 @@
     PyObject *return_value = NULL;
     Py_buffer data = {NULL, NULL};
 
-    if (!PyArg_Parse(arg, "y*:compress", &data)) {
+    if (PyObject_GetBuffer(arg, &data, PyBUF_SIMPLE) != 0) {
+        goto exit;
+    }
+    if (!PyBuffer_IsContiguous(&data, 'C')) {
+        _PyArg_BadArgument("compress", "contiguous buffer", arg);
         goto exit;
     }
     return_value = zlib_Compress_compress_impl(self, &data);
@@ -553,4 +557,4 @@
 #ifndef ZLIB_DECOMPRESS___DEEPCOPY___METHODDEF
     #define ZLIB_DECOMPRESS___DEEPCOPY___METHODDEF
 #endif /* !defined(ZLIB_DECOMPRESS___DEEPCOPY___METHODDEF) */
-/*[clinic end generated code: output=e721c15e7af2d2fd input=a9049054013a1b77]*/
+/*[clinic end generated code: output=bea1e3c64573d9fd input=a9049054013a1b77]*/
diff --git a/Objects/clinic/bytearrayobject.c.h b/Objects/clinic/bytearrayobject.c.h
index f21353a..ec35eef 100644
--- a/Objects/clinic/bytearrayobject.c.h
+++ b/Objects/clinic/bytearrayobject.c.h
@@ -354,7 +354,7 @@
     PyObject *return_value = NULL;
     int item;
 
-    if (!PyArg_Parse(arg, "O&:append", _getbytevalue, &item)) {
+    if (!_getbytevalue(arg, &item)) {
         goto exit;
     }
     return_value = bytearray_append_impl(self, item);
@@ -430,7 +430,7 @@
     PyObject *return_value = NULL;
     int value;
 
-    if (!PyArg_Parse(arg, "O&:remove", _getbytevalue, &value)) {
+    if (!_getbytevalue(arg, &value)) {
         goto exit;
     }
     return_value = bytearray_remove_impl(self, value);
@@ -640,9 +640,14 @@
     PyObject *return_value = NULL;
     PyObject *string;
 
-    if (!PyArg_Parse(arg, "U:fromhex", &string)) {
+    if (!PyUnicode_Check(arg)) {
+        _PyArg_BadArgument("fromhex", "str", arg);
         goto exit;
     }
+    if (PyUnicode_READY(arg) == -1) {
+        goto exit;
+    }
+    string = arg;
     return_value = bytearray_fromhex_impl(type, string);
 
 exit:
@@ -712,4 +717,4 @@
 {
     return bytearray_sizeof_impl(self);
 }
-/*[clinic end generated code: output=b88bb192dddca6e1 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=cd3e13a1905a473c input=a9049054013a1b77]*/
diff --git a/Objects/clinic/bytesobject.c.h b/Objects/clinic/bytesobject.c.h
index 193d534..1345b64 100644
--- a/Objects/clinic/bytesobject.c.h
+++ b/Objects/clinic/bytesobject.c.h
@@ -66,7 +66,11 @@
     PyObject *return_value = NULL;
     Py_buffer sep = {NULL, NULL};
 
-    if (!PyArg_Parse(arg, "y*:partition", &sep)) {
+    if (PyObject_GetBuffer(arg, &sep, PyBUF_SIMPLE) != 0) {
+        goto exit;
+    }
+    if (!PyBuffer_IsContiguous(&sep, 'C')) {
+        _PyArg_BadArgument("partition", "contiguous buffer", arg);
         goto exit;
     }
     return_value = bytes_partition_impl(self, &sep);
@@ -105,7 +109,11 @@
     PyObject *return_value = NULL;
     Py_buffer sep = {NULL, NULL};
 
-    if (!PyArg_Parse(arg, "y*:rpartition", &sep)) {
+    if (PyObject_GetBuffer(arg, &sep, PyBUF_SIMPLE) != 0) {
+        goto exit;
+    }
+    if (!PyBuffer_IsContiguous(&sep, 'C')) {
+        _PyArg_BadArgument("rpartition", "contiguous buffer", arg);
         goto exit;
     }
     return_value = bytes_rpartition_impl(self, &sep);
@@ -491,12 +499,17 @@
     PyObject *return_value = NULL;
     PyObject *string;
 
-    if (!PyArg_Parse(arg, "U:fromhex", &string)) {
+    if (!PyUnicode_Check(arg)) {
+        _PyArg_BadArgument("fromhex", "str", arg);
         goto exit;
     }
+    if (PyUnicode_READY(arg) == -1) {
+        goto exit;
+    }
+    string = arg;
     return_value = bytes_fromhex_impl(type, string);
 
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=07b33ac65362301b input=a9049054013a1b77]*/
+/*[clinic end generated code: output=dc9aa04f0007ab11 input=a9049054013a1b77]*/
diff --git a/Objects/clinic/floatobject.c.h b/Objects/clinic/floatobject.c.h
index 8ff2a2b..28b24d0 100644
--- a/Objects/clinic/floatobject.c.h
+++ b/Objects/clinic/floatobject.c.h
@@ -228,7 +228,17 @@
     PyObject *return_value = NULL;
     const char *typestr;
 
-    if (!PyArg_Parse(arg, "s:__getformat__", &typestr)) {
+    if (!PyUnicode_Check(arg)) {
+        _PyArg_BadArgument("__getformat__", "str", arg);
+        goto exit;
+    }
+    Py_ssize_t typestr_length;
+    typestr = PyUnicode_AsUTF8AndSize(arg, &typestr_length);
+    if (typestr == NULL) {
+        goto exit;
+    }
+    if (strlen(typestr) != (size_t)typestr_length) {
+        PyErr_SetString(PyExc_ValueError, "embedded null character");
         goto exit;
     }
     return_value = float___getformat___impl(type, typestr);
@@ -297,12 +307,17 @@
     PyObject *return_value = NULL;
     PyObject *format_spec;
 
-    if (!PyArg_Parse(arg, "U:__format__", &format_spec)) {
+    if (!PyUnicode_Check(arg)) {
+        _PyArg_BadArgument("__format__", "str", arg);
         goto exit;
     }
+    if (PyUnicode_READY(arg) == -1) {
+        goto exit;
+    }
+    format_spec = arg;
     return_value = float___format___impl(self, format_spec);
 
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=091dd499f5386a6c input=a9049054013a1b77]*/
+/*[clinic end generated code: output=e8f8be828462d58b input=a9049054013a1b77]*/
diff --git a/Objects/clinic/longobject.c.h b/Objects/clinic/longobject.c.h
index 3c33993..27cdf9e 100644
--- a/Objects/clinic/longobject.c.h
+++ b/Objects/clinic/longobject.c.h
@@ -58,9 +58,14 @@
     PyObject *return_value = NULL;
     PyObject *format_spec;
 
-    if (!PyArg_Parse(arg, "U:__format__", &format_spec)) {
+    if (!PyUnicode_Check(arg)) {
+        _PyArg_BadArgument("__format__", "str", arg);
         goto exit;
     }
+    if (PyUnicode_READY(arg) == -1) {
+        goto exit;
+    }
+    format_spec = arg;
     return_value = int___format___impl(self, format_spec);
 
 exit:
@@ -239,4 +244,4 @@
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=403ccd096555fd1e input=a9049054013a1b77]*/
+/*[clinic end generated code: output=7436b5f4decdcf9d input=a9049054013a1b77]*/
diff --git a/Objects/clinic/typeobject.c.h b/Objects/clinic/typeobject.c.h
index 2760065..115a218 100644
--- a/Objects/clinic/typeobject.c.h
+++ b/Objects/clinic/typeobject.c.h
@@ -166,7 +166,13 @@
     PyObject *return_value = NULL;
     int protocol;
 
-    if (!PyArg_Parse(arg, "i:__reduce_ex__", &protocol)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    protocol = _PyLong_AsInt(arg);
+    if (protocol == -1 && PyErr_Occurred()) {
         goto exit;
     }
     return_value = object___reduce_ex___impl(self, protocol);
@@ -193,9 +199,14 @@
     PyObject *return_value = NULL;
     PyObject *format_spec;
 
-    if (!PyArg_Parse(arg, "U:__format__", &format_spec)) {
+    if (!PyUnicode_Check(arg)) {
+        _PyArg_BadArgument("__format__", "str", arg);
         goto exit;
     }
+    if (PyUnicode_READY(arg) == -1) {
+        goto exit;
+    }
+    format_spec = arg;
     return_value = object___format___impl(self, format_spec);
 
 exit:
@@ -237,4 +248,4 @@
 {
     return object___dir___impl(self);
 }
-/*[clinic end generated code: output=8c4c856859564eaa input=a9049054013a1b77]*/
+/*[clinic end generated code: output=09f3453839e60136 input=a9049054013a1b77]*/
diff --git a/Objects/clinic/unicodeobject.c.h b/Objects/clinic/unicodeobject.c.h
index 273ae92..744a6eb 100644
--- a/Objects/clinic/unicodeobject.c.h
+++ b/Objects/clinic/unicodeobject.c.h
@@ -898,9 +898,23 @@
     PyObject *return_value = NULL;
     Py_ssize_t width;
 
-    if (!PyArg_Parse(arg, "n:zfill", &width)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
         goto exit;
     }
+    {
+        Py_ssize_t ival = -1;
+        PyObject *iobj = PyNumber_Index(arg);
+        if (iobj != NULL) {
+            ival = PyLong_AsSsize_t(iobj);
+            Py_DECREF(iobj);
+        }
+        if (ival == -1 && PyErr_Occurred()) {
+            goto exit;
+        }
+        width = ival;
+    }
     return_value = unicode_zfill_impl(self, width);
 
 exit:
@@ -925,9 +939,14 @@
     PyObject *return_value = NULL;
     PyObject *format_spec;
 
-    if (!PyArg_Parse(arg, "U:__format__", &format_spec)) {
+    if (!PyUnicode_Check(arg)) {
+        _PyArg_BadArgument("__format__", "str", arg);
         goto exit;
     }
+    if (PyUnicode_READY(arg) == -1) {
+        goto exit;
+    }
+    format_spec = arg;
     return_value = unicode___format___impl(self, format_spec);
 
 exit:
@@ -951,4 +970,4 @@
 {
     return unicode_sizeof_impl(self);
 }
-/*[clinic end generated code: output=d323802b67bfc6d8 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=ff6acd5abd1998eb input=a9049054013a1b77]*/
diff --git a/Objects/stringlib/clinic/transmogrify.h.h b/Objects/stringlib/clinic/transmogrify.h.h
index fb63060..7b7fd58 100644
--- a/Objects/stringlib/clinic/transmogrify.h.h
+++ b/Objects/stringlib/clinic/transmogrify.h.h
@@ -147,12 +147,26 @@
     PyObject *return_value = NULL;
     Py_ssize_t width;
 
-    if (!PyArg_Parse(arg, "n:zfill", &width)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
         goto exit;
     }
+    {
+        Py_ssize_t ival = -1;
+        PyObject *iobj = PyNumber_Index(arg);
+        if (iobj != NULL) {
+            ival = PyLong_AsSsize_t(iobj);
+            Py_DECREF(iobj);
+        }
+        if (ival == -1 && PyErr_Occurred()) {
+            goto exit;
+        }
+        width = ival;
+    }
     return_value = stringlib_zfill_impl(self, width);
 
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=d09ba158d470566e input=a9049054013a1b77]*/
+/*[clinic end generated code: output=bf2ef501639e1190 input=a9049054013a1b77]*/
diff --git a/PC/clinic/msvcrtmodule.c.h b/PC/clinic/msvcrtmodule.c.h
index 0466306..b1c588b 100644
--- a/PC/clinic/msvcrtmodule.c.h
+++ b/PC/clinic/msvcrtmodule.c.h
@@ -158,7 +158,13 @@
     int fd;
     void *_return_value;
 
-    if (!PyArg_Parse(arg, "i:get_osfhandle", &fd)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    fd = _PyLong_AsInt(arg);
+    if (fd == -1 && PyErr_Occurred()) {
         goto exit;
     }
     _return_value = msvcrt_get_osfhandle_impl(module, fd);
@@ -319,7 +325,14 @@
     PyObject *return_value = NULL;
     char char_value;
 
-    if (!PyArg_Parse(arg, "c:putch", &char_value)) {
+    if (PyBytes_Check(arg) && PyBytes_GET_SIZE(arg) == 1) {
+        char_value = PyBytes_AS_STRING(arg)[0];
+    }
+    else if (PyByteArray_Check(arg) && PyByteArray_GET_SIZE(arg) == 1) {
+        char_value = PyByteArray_AS_STRING(arg)[0];
+    }
+    else {
+        _PyArg_BadArgument("putch", "a byte string of length 1", arg);
         goto exit;
     }
     return_value = msvcrt_putch_impl(module, char_value);
@@ -346,9 +359,18 @@
     PyObject *return_value = NULL;
     int unicode_char;
 
-    if (!PyArg_Parse(arg, "C:putwch", &unicode_char)) {
+    if (!PyUnicode_Check(arg)) {
+        _PyArg_BadArgument("putwch", "a unicode character", arg);
         goto exit;
     }
+    if (PyUnicode_READY(arg)) {
+        goto exit;
+    }
+    if (PyUnicode_GET_LENGTH(arg) != 1) {
+        _PyArg_BadArgument("putwch", "a unicode character", arg);
+        goto exit;
+    }
+    unicode_char = PyUnicode_READ_CHAR(arg, 0);
     return_value = msvcrt_putwch_impl(module, unicode_char);
 
 exit:
@@ -377,7 +399,14 @@
     PyObject *return_value = NULL;
     char char_value;
 
-    if (!PyArg_Parse(arg, "c:ungetch", &char_value)) {
+    if (PyBytes_Check(arg) && PyBytes_GET_SIZE(arg) == 1) {
+        char_value = PyBytes_AS_STRING(arg)[0];
+    }
+    else if (PyByteArray_Check(arg) && PyByteArray_GET_SIZE(arg) == 1) {
+        char_value = PyByteArray_AS_STRING(arg)[0];
+    }
+    else {
+        _PyArg_BadArgument("ungetch", "a byte string of length 1", arg);
         goto exit;
     }
     return_value = msvcrt_ungetch_impl(module, char_value);
@@ -404,9 +433,18 @@
     PyObject *return_value = NULL;
     int unicode_char;
 
-    if (!PyArg_Parse(arg, "C:ungetwch", &unicode_char)) {
+    if (!PyUnicode_Check(arg)) {
+        _PyArg_BadArgument("ungetwch", "a unicode character", arg);
         goto exit;
     }
+    if (PyUnicode_READY(arg)) {
+        goto exit;
+    }
+    if (PyUnicode_GET_LENGTH(arg) != 1) {
+        _PyArg_BadArgument("ungetwch", "a unicode character", arg);
+        goto exit;
+    }
+    unicode_char = PyUnicode_READ_CHAR(arg, 0);
     return_value = msvcrt_ungetwch_impl(module, unicode_char);
 
 exit:
@@ -516,7 +554,13 @@
     int mode;
     long _return_value;
 
-    if (!PyArg_Parse(arg, "i:set_error_mode", &mode)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    mode = _PyLong_AsInt(arg);
+    if (mode == -1 && PyErr_Occurred()) {
         goto exit;
     }
     _return_value = msvcrt_set_error_mode_impl(module, mode);
@@ -549,7 +593,13 @@
     PyObject *return_value = NULL;
     unsigned int mode;
 
-    if (!PyArg_Parse(arg, "I:SetErrorMode", &mode)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    mode = (unsigned int)PyLong_AsUnsignedLongMask(arg);
+    if (mode == (unsigned int)-1 && PyErr_Occurred()) {
         goto exit;
     }
     return_value = msvcrt_SetErrorMode_impl(module, mode);
@@ -569,4 +619,4 @@
 #ifndef MSVCRT_SET_ERROR_MODE_METHODDEF
     #define MSVCRT_SET_ERROR_MODE_METHODDEF
 #endif /* !defined(MSVCRT_SET_ERROR_MODE_METHODDEF) */
-/*[clinic end generated code: output=632089ff9236ac77 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=2530b4ff248563b4 input=a9049054013a1b77]*/
diff --git a/PC/clinic/winreg.c.h b/PC/clinic/winreg.c.h
index a7385a6..3b100f9 100644
--- a/PC/clinic/winreg.c.h
+++ b/PC/clinic/winreg.c.h
@@ -541,7 +541,7 @@
     PyObject *return_value = NULL;
     HKEY key;
 
-    if (!PyArg_Parse(arg, "O&:FlushKey", clinic_HKEY_converter, &key)) {
+    if (!clinic_HKEY_converter(arg, &key)) {
         goto exit;
     }
     return_value = winreg_FlushKey_impl(module, key);
@@ -734,7 +734,7 @@
     PyObject *return_value = NULL;
     HKEY key;
 
-    if (!PyArg_Parse(arg, "O&:QueryInfoKey", clinic_HKEY_converter, &key)) {
+    if (!clinic_HKEY_converter(arg, &key)) {
         goto exit;
     }
     return_value = winreg_QueryInfoKey_impl(module, key);
@@ -1021,7 +1021,7 @@
     PyObject *return_value = NULL;
     HKEY key;
 
-    if (!PyArg_Parse(arg, "O&:DisableReflectionKey", clinic_HKEY_converter, &key)) {
+    if (!clinic_HKEY_converter(arg, &key)) {
         goto exit;
     }
     return_value = winreg_DisableReflectionKey_impl(module, key);
@@ -1055,7 +1055,7 @@
     PyObject *return_value = NULL;
     HKEY key;
 
-    if (!PyArg_Parse(arg, "O&:EnableReflectionKey", clinic_HKEY_converter, &key)) {
+    if (!clinic_HKEY_converter(arg, &key)) {
         goto exit;
     }
     return_value = winreg_EnableReflectionKey_impl(module, key);
@@ -1087,7 +1087,7 @@
     PyObject *return_value = NULL;
     HKEY key;
 
-    if (!PyArg_Parse(arg, "O&:QueryReflectionKey", clinic_HKEY_converter, &key)) {
+    if (!clinic_HKEY_converter(arg, &key)) {
         goto exit;
     }
     return_value = winreg_QueryReflectionKey_impl(module, key);
@@ -1095,4 +1095,4 @@
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=ff2cc1951ab1a56c input=a9049054013a1b77]*/
+/*[clinic end generated code: output=82bd56c524c6c3dd input=a9049054013a1b77]*/
diff --git a/Python/clinic/bltinmodule.c.h b/Python/clinic/bltinmodule.c.h
index 4a79861..7f043da 100644
--- a/Python/clinic/bltinmodule.c.h
+++ b/Python/clinic/bltinmodule.c.h
@@ -122,7 +122,13 @@
     PyObject *return_value = NULL;
     int i;
 
-    if (!PyArg_Parse(arg, "i:chr", &i)) {
+    if (PyFloat_Check(arg)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "integer argument expected, got float" );
+        goto exit;
+    }
+    i = _PyLong_AsInt(arg);
+    if (i == -1 && PyErr_Occurred()) {
         goto exit;
     }
     return_value = builtin_chr_impl(module, i);
@@ -711,4 +717,4 @@
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=fa8d97ac8695363b input=a9049054013a1b77]*/
+/*[clinic end generated code: output=ed300ebf3f6db530 input=a9049054013a1b77]*/
diff --git a/Python/clinic/import.c.h b/Python/clinic/import.c.h
index 1eae8f2..d34d68f 100644
--- a/Python/clinic/import.c.h
+++ b/Python/clinic/import.c.h
@@ -143,9 +143,14 @@
     PyObject *return_value = NULL;
     PyObject *name;
 
-    if (!PyArg_Parse(arg, "U:init_frozen", &name)) {
+    if (!PyUnicode_Check(arg)) {
+        _PyArg_BadArgument("init_frozen", "str", arg);
         goto exit;
     }
+    if (PyUnicode_READY(arg) == -1) {
+        goto exit;
+    }
+    name = arg;
     return_value = _imp_init_frozen_impl(module, name);
 
 exit:
@@ -170,9 +175,14 @@
     PyObject *return_value = NULL;
     PyObject *name;
 
-    if (!PyArg_Parse(arg, "U:get_frozen_object", &name)) {
+    if (!PyUnicode_Check(arg)) {
+        _PyArg_BadArgument("get_frozen_object", "str", arg);
         goto exit;
     }
+    if (PyUnicode_READY(arg) == -1) {
+        goto exit;
+    }
+    name = arg;
     return_value = _imp_get_frozen_object_impl(module, name);
 
 exit:
@@ -197,9 +207,14 @@
     PyObject *return_value = NULL;
     PyObject *name;
 
-    if (!PyArg_Parse(arg, "U:is_frozen_package", &name)) {
+    if (!PyUnicode_Check(arg)) {
+        _PyArg_BadArgument("is_frozen_package", "str", arg);
         goto exit;
     }
+    if (PyUnicode_READY(arg) == -1) {
+        goto exit;
+    }
+    name = arg;
     return_value = _imp_is_frozen_package_impl(module, name);
 
 exit:
@@ -224,9 +239,14 @@
     PyObject *return_value = NULL;
     PyObject *name;
 
-    if (!PyArg_Parse(arg, "U:is_builtin", &name)) {
+    if (!PyUnicode_Check(arg)) {
+        _PyArg_BadArgument("is_builtin", "str", arg);
         goto exit;
     }
+    if (PyUnicode_READY(arg) == -1) {
+        goto exit;
+    }
+    name = arg;
     return_value = _imp_is_builtin_impl(module, name);
 
 exit:
@@ -251,9 +271,14 @@
     PyObject *return_value = NULL;
     PyObject *name;
 
-    if (!PyArg_Parse(arg, "U:is_frozen", &name)) {
+    if (!PyUnicode_Check(arg)) {
+        _PyArg_BadArgument("is_frozen", "str", arg);
         goto exit;
     }
+    if (PyUnicode_READY(arg) == -1) {
+        goto exit;
+    }
+    name = arg;
     return_value = _imp_is_frozen_impl(module, name);
 
 exit:
@@ -396,4 +421,4 @@
 #ifndef _IMP_EXEC_DYNAMIC_METHODDEF
     #define _IMP_EXEC_DYNAMIC_METHODDEF
 #endif /* !defined(_IMP_EXEC_DYNAMIC_METHODDEF) */
-/*[clinic end generated code: output=ad747b76e105fff2 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=d8be58c9541122f1 input=a9049054013a1b77]*/
diff --git a/Python/clinic/marshal.c.h b/Python/clinic/marshal.c.h
index 0df4935..516a315 100644
--- a/Python/clinic/marshal.c.h
+++ b/Python/clinic/marshal.c.h
@@ -121,7 +121,11 @@
     PyObject *return_value = NULL;
     Py_buffer bytes = {NULL, NULL};
 
-    if (!PyArg_Parse(arg, "y*:loads", &bytes)) {
+    if (PyObject_GetBuffer(arg, &bytes, PyBUF_SIMPLE) != 0) {
+        goto exit;
+    }
+    if (!PyBuffer_IsContiguous(&bytes, 'C')) {
+        _PyArg_BadArgument("loads", "contiguous buffer", arg);
         goto exit;
     }
     return_value = marshal_loads_impl(module, &bytes);
@@ -134,4 +138,4 @@
 
     return return_value;
 }
-/*[clinic end generated code: output=cbb6128201bee7e0 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=8262e7e6c8cbc1ef input=a9049054013a1b77]*/
diff --git a/Python/getargs.c b/Python/getargs.c
index 00e330d..550d0df 100644
--- a/Python/getargs.c
+++ b/Python/getargs.c
@@ -612,6 +612,14 @@
 
 /* Format an error message generated by convertsimple(). */
 
+void
+_PyArg_BadArgument(const char *fname, const char *expected, PyObject *arg)
+{
+    PyErr_Format(PyExc_TypeError, "%.200s() argument must be %.50s, not %.50s",
+                 fname, expected,
+                 arg == Py_None ? "None" : arg->ob_type->tp_name);
+}
+
 static const char *
 converterr(const char *expected, PyObject *arg, char *msgbuf, size_t bufsize)
 {
diff --git a/Tools/clinic/clinic.py b/Tools/clinic/clinic.py
index b0acbcf..3627725 100755
--- a/Tools/clinic/clinic.py
+++ b/Tools/clinic/clinic.py
@@ -807,11 +807,10 @@
                     {c_basename}({self_type}{self_name}, PyObject *%s)
                     """ % argname)
 
-                parser_definition = parser_body(parser_prototype, normalize_snippet("""
-                    if (!PyArg_Parse(%s, "{format_units}:{name}", {parse_arguments})) {{
-                        goto exit;
-                    }}
-                    """ % argname, indent=4))
+                parsearg = converters[0].parse_arg(argname)
+                assert parsearg is not None
+                parser_definition = parser_body(parser_prototype,
+                                                normalize_snippet(parsearg, indent=4))
 
         elif has_option_groups:
             # positional parameters with option groups
@@ -2346,7 +2345,7 @@
 
     # keep in sync with self_converter.__init__!
     def __init__(self, name, py_name, function, default=unspecified, *, c_default=None, py_default=None, annotation=unspecified, **kwargs):
-        self.name = name
+        self.name = ensure_legal_c_identifier(name)
         self.py_name = py_name
 
         if default is not unspecified:
@@ -2383,8 +2382,7 @@
 
     def _render_self(self, parameter, data):
         self.parameter = parameter
-        original_name = self.name
-        name = ensure_legal_c_identifier(original_name)
+        name = self.name
 
         # impl_arguments
         s = ("&" if self.impl_by_reference else "") + name
@@ -2399,8 +2397,7 @@
 
     def _render_non_self(self, parameter, data):
         self.parameter = parameter
-        original_name = self.name
-        name = ensure_legal_c_identifier(original_name)
+        name = self.name
 
         # declarations
         d = self.declaration()
@@ -2449,7 +2446,7 @@
         """Computes the name of the associated "length" variable."""
         if not self.length:
             return None
-        return ensure_legal_c_identifier(self.name) + "_length"
+        return self.name + "_length"
 
     # Why is this one broken out separately?
     # For "positional-only" function parsing,
@@ -2465,8 +2462,7 @@
         elif self.subclass_of:
             list.append(self.subclass_of)
 
-        legal_name = ensure_legal_c_identifier(self.name)
-        s = ("&" if self.parse_by_reference else "") + legal_name
+        s = ("&" if self.parse_by_reference else "") + self.name
         list.append(s)
 
         if self.length:
@@ -2487,7 +2483,7 @@
             prototype.append(" ")
         if by_reference:
             prototype.append('*')
-        prototype.append(ensure_legal_c_identifier(self.name))
+        prototype.append(self.name)
         return "".join(prototype)
 
     def declaration(self):
@@ -2540,6 +2536,52 @@
         """
         pass
 
+    def parse_arg(self, argname):
+        if self.format_unit == 'O&':
+            return """
+                if (!{converter}({argname}, &{paramname})) {{{{
+                    goto exit;
+                }}}}
+                """.format(argname=argname, paramname=self.name,
+                           converter=self.converter)
+        if self.format_unit == 'O!':
+            cast = '(%s)' % self.type if self.type != 'PyObject *' else ''
+            if self.subclass_of in type_checks:
+                typecheck, typename = type_checks[self.subclass_of]
+                return """
+                    if (!{typecheck}({argname})) {{{{
+                        _PyArg_BadArgument("{{name}}", "{typename}", {argname});
+                        goto exit;
+                    }}}}
+                    {paramname} = {cast}{argname};
+                    """.format(argname=argname, paramname=self.name,
+                               typecheck=typecheck, typename=typename, cast=cast)
+            return """
+                if (!PyObject_TypeCheck({argname}, {subclass_of})) {{{{
+                    _PyArg_BadArgument("{{name}}", ({subclass_of})->tp_name, {argname});
+                    goto exit;
+                }}}}
+                {paramname} = {cast}{argname};
+                """.format(argname=argname, paramname=self.name,
+                           subclass_of=self.subclass_of, cast=cast)
+        return """
+            if (!PyArg_Parse(%s, "{format_units}:{name}", {parse_arguments})) {{
+                goto exit;
+            }}
+            """ % argname
+
+type_checks = {
+    '&PyLong_Type': ('PyLong_Check', 'int'),
+    '&PyTuple_Type': ('PyTuple_Check', 'tuple'),
+    '&PyList_Type': ('PyList_Check', 'list'),
+    '&PySet_Type': ('PySet_Check', 'set'),
+    '&PyFrozenSet_Type': ('PyFrozenSet_Check', 'frozenset'),
+    '&PyDict_Type': ('PyDict_Check', 'dict'),
+    '&PyUnicode_Type': ('PyUnicode_Check', 'str'),
+    '&PyBytes_Type': ('PyBytes_Check', 'bytes'),
+    '&PyByteArray_Type': ('PyByteArray_Check', 'bytearray'),
+}
+
 
 class bool_converter(CConverter):
     type = 'int'
@@ -2556,6 +2598,28 @@
             self.default = bool(self.default)
             self.c_default = str(int(self.default))
 
+    def parse_arg(self, argname):
+        if self.format_unit == 'i':
+            return """
+                if (PyFloat_Check({argname})) {{{{
+                    PyErr_SetString(PyExc_TypeError,
+                                    "integer argument expected, got float" );
+                    goto exit;
+                }}}}
+                {paramname} = _PyLong_AsInt({argname});
+                if ({paramname} == -1 && PyErr_Occurred()) {{{{
+                    goto exit;
+                }}}}
+                """.format(argname=argname, paramname=self.name)
+        elif self.format_unit == 'p':
+            return """
+                {paramname} = PyObject_IsTrue({argname});
+                if ({paramname} < 0) {{{{
+                    goto exit;
+                }}}}
+                """.format(argname=argname, paramname=self.name)
+        return super().parse_arg(argname)
+
 class char_converter(CConverter):
     type = 'char'
     default_type = (bytes, bytearray)
@@ -2571,6 +2635,22 @@
             if self.c_default == '"\'"':
                 self.c_default = r"'\''"
 
+    def parse_arg(self, argname):
+        if self.format_unit == 'c':
+            return """
+                if (PyBytes_Check({argname}) && PyBytes_GET_SIZE({argname}) == 1) {{{{
+                    {paramname} = PyBytes_AS_STRING({argname})[0];
+                }}}}
+                else if (PyByteArray_Check({argname}) && PyByteArray_GET_SIZE({argname}) == 1) {{{{
+                    {paramname} = PyByteArray_AS_STRING({argname})[0];
+                }}}}
+                else {{{{
+                    _PyArg_BadArgument("{{name}}", "a byte string of length 1", {argname});
+                    goto exit;
+                }}}}
+                """.format(argname=argname, paramname=self.name)
+        return super().parse_arg(argname)
+
 
 @add_legacy_c_converter('B', bitwise=True)
 class unsigned_char_converter(CConverter):
@@ -2583,6 +2663,53 @@
         if bitwise:
             self.format_unit = 'B'
 
+    def parse_arg(self, argname):
+        if self.format_unit == 'b':
+            return """
+                if (PyFloat_Check({argname})) {{{{
+                    PyErr_SetString(PyExc_TypeError,
+                                    "integer argument expected, got float" );
+                    goto exit;
+                }}}}
+                {{{{
+                    long ival = PyLong_AsLong({argname});
+                    if (ival == -1 && PyErr_Occurred()) {{{{
+                        goto exit;
+                    }}}}
+                    else if (ival < 0) {{{{
+                        PyErr_SetString(PyExc_OverflowError,
+                                        "unsigned byte integer is less than minimum");
+                        goto exit;
+                    }}}}
+                    else if (ival > UCHAR_MAX) {{{{
+                        PyErr_SetString(PyExc_OverflowError,
+                                        "unsigned byte integer is greater than maximum");
+                        goto exit;
+                    }}}}
+                    else {{{{
+                        {paramname} = (unsigned char) ival;
+                    }}}}
+                }}}}
+                """.format(argname=argname, paramname=self.name)
+        elif self.format_unit == 'B':
+            return """
+                if (PyFloat_Check({argname})) {{{{
+                    PyErr_SetString(PyExc_TypeError,
+                                    "integer argument expected, got float" );
+                    goto exit;
+                }}}}
+                {{{{
+                    long ival = PyLong_AsUnsignedLongMask({argname});
+                    if (ival == -1 && PyErr_Occurred()) {{{{
+                        goto exit;
+                    }}}}
+                    else {{{{
+                        {paramname} = (unsigned char) ival;
+                    }}}}
+                }}}}
+                """.format(argname=argname, paramname=self.name)
+        return super().parse_arg(argname)
+
 class byte_converter(unsigned_char_converter): pass
 
 class short_converter(CConverter):
@@ -2591,6 +2718,36 @@
     format_unit = 'h'
     c_ignored_default = "0"
 
+    def parse_arg(self, argname):
+        if self.format_unit == 'h':
+            return """
+                if (PyFloat_Check({argname})) {{{{
+                    PyErr_SetString(PyExc_TypeError,
+                                    "integer argument expected, got float" );
+                    goto exit;
+                }}}}
+                {{{{
+                    long ival = PyLong_AsLong({argname});
+                    if (ival == -1 && PyErr_Occurred()) {{{{
+                        goto exit;
+                    }}}}
+                    else if (ival < SHRT_MIN) {{{{
+                        PyErr_SetString(PyExc_OverflowError,
+                                        "signed short integer is less than minimum");
+                        goto exit;
+                    }}}}
+                    else if (ival > SHRT_MAX) {{{{
+                        PyErr_SetString(PyExc_OverflowError,
+                                        "signed short integer is greater than maximum");
+                        goto exit;
+                    }}}}
+                    else {{{{
+                        {paramname} = (short) ival;
+                    }}}}
+                }}}}
+                """.format(argname=argname, paramname=self.name)
+        return super().parse_arg(argname)
+
 class unsigned_short_converter(CConverter):
     type = 'unsigned short'
     default_type = int
@@ -2617,6 +2774,36 @@
         if type != None:
             self.type = type
 
+    def parse_arg(self, argname):
+        if self.format_unit == 'i':
+            return """
+                if (PyFloat_Check({argname})) {{{{
+                    PyErr_SetString(PyExc_TypeError,
+                                    "integer argument expected, got float" );
+                    goto exit;
+                }}}}
+                {paramname} = _PyLong_AsInt({argname});
+                if ({paramname} == -1 && PyErr_Occurred()) {{{{
+                    goto exit;
+                }}}}
+                """.format(argname=argname, paramname=self.name)
+        elif self.format_unit == 'C':
+            return """
+                if (!PyUnicode_Check({argname})) {{{{
+                    _PyArg_BadArgument("{{name}}", "a unicode character", {argname});
+                    goto exit;
+                }}}}
+                if (PyUnicode_READY({argname})) {{{{
+                    goto exit;
+                }}}}
+                if (PyUnicode_GET_LENGTH({argname}) != 1) {{{{
+                    _PyArg_BadArgument("{{name}}", "a unicode character", {argname});
+                    goto exit;
+                }}}}
+                {paramname} = PyUnicode_READ_CHAR({argname}, 0);
+                """.format(argname=argname, paramname=self.name)
+        return super().parse_arg(argname)
+
 class unsigned_int_converter(CConverter):
     type = 'unsigned int'
     default_type = int
@@ -2628,12 +2815,42 @@
         else:
             self.converter = '_PyLong_UnsignedInt_Converter'
 
+    def parse_arg(self, argname):
+        if self.format_unit == 'I':
+            return """
+                if (PyFloat_Check({argname})) {{{{
+                    PyErr_SetString(PyExc_TypeError,
+                                    "integer argument expected, got float" );
+                    goto exit;
+                }}}}
+                {paramname} = (unsigned int)PyLong_AsUnsignedLongMask({argname});
+                if ({paramname} == (unsigned int)-1 && PyErr_Occurred()) {{{{
+                    goto exit;
+                }}}}
+                """.format(argname=argname, paramname=self.name)
+        return super().parse_arg(argname)
+
 class long_converter(CConverter):
     type = 'long'
     default_type = int
     format_unit = 'l'
     c_ignored_default = "0"
 
+    def parse_arg(self, argname):
+        if self.format_unit == 'l':
+            return """
+                if (PyFloat_Check({argname})) {{{{
+                    PyErr_SetString(PyExc_TypeError,
+                                    "integer argument expected, got float" );
+                    goto exit;
+                }}}}
+                {paramname} = PyLong_AsLong({argname});
+                if ({paramname} == -1 && PyErr_Occurred()) {{{{
+                    goto exit;
+                }}}}
+                """.format(argname=argname, paramname=self.name)
+        return super().parse_arg(argname)
+
 class unsigned_long_converter(CConverter):
     type = 'unsigned long'
     default_type = int
@@ -2645,12 +2862,38 @@
         else:
             self.converter = '_PyLong_UnsignedLong_Converter'
 
+    def parse_arg(self, argname):
+        if self.format_unit == 'k':
+            return """
+                if (!PyLong_Check({argname})) {{{{
+                    _PyArg_BadArgument("{{name}}", "int", {argname});
+                    goto exit;
+                }}}}
+                {paramname} = PyLong_AsUnsignedLongMask({argname});
+                """.format(argname=argname, paramname=self.name)
+        return super().parse_arg(argname)
+
 class long_long_converter(CConverter):
     type = 'long long'
     default_type = int
     format_unit = 'L'
     c_ignored_default = "0"
 
+    def parse_arg(self, argname):
+        if self.format_unit == 'L':
+            return """
+                if (PyFloat_Check({argname})) {{{{
+                    PyErr_SetString(PyExc_TypeError,
+                                    "integer argument expected, got float" );
+                    goto exit;
+                }}}}
+                {paramname} = PyLong_AsLongLong({argname});
+                if ({paramname} == (PY_LONG_LONG)-1 && PyErr_Occurred()) {{{{
+                    goto exit;
+                }}}}
+                """.format(argname=argname, paramname=self.name)
+        return super().parse_arg(argname)
+
 class unsigned_long_long_converter(CConverter):
     type = 'unsigned long long'
     default_type = int
@@ -2662,6 +2905,17 @@
         else:
             self.converter = '_PyLong_UnsignedLongLong_Converter'
 
+    def parse_arg(self, argname):
+        if self.format_unit == 'K':
+            return """
+                if (!PyLong_Check({argname})) {{{{
+                    _PyArg_BadArgument("{{name}}", "int", {argname});
+                    goto exit;
+                }}}}
+                {paramname} = PyLong_AsUnsignedLongLongMask({argname});
+                """.format(argname=argname, paramname=self.name)
+        return super().parse_arg(argname)
+
 class Py_ssize_t_converter(CConverter):
     type = 'Py_ssize_t'
     c_ignored_default = "0"
@@ -2675,6 +2929,29 @@
         else:
             fail("Py_ssize_t_converter: illegal 'accept' argument " + repr(accept))
 
+    def parse_arg(self, argname):
+        if self.format_unit == 'n':
+            return """
+                if (PyFloat_Check({argname})) {{{{
+                    PyErr_SetString(PyExc_TypeError,
+                                    "integer argument expected, got float" );
+                    goto exit;
+                }}}}
+                {{{{
+                    Py_ssize_t ival = -1;
+                    PyObject *iobj = PyNumber_Index({argname});
+                    if (iobj != NULL) {{{{
+                        ival = PyLong_AsSsize_t(iobj);
+                        Py_DECREF(iobj);
+                    }}}}
+                    if (ival == -1 && PyErr_Occurred()) {{{{
+                        goto exit;
+                    }}}}
+                    {paramname} = ival;
+                }}}}
+                """.format(argname=argname, paramname=self.name)
+        return super().parse_arg(argname)
+
 
 class slice_index_converter(CConverter):
     type = 'Py_ssize_t'
@@ -2692,6 +2969,16 @@
     converter = '_PyLong_Size_t_Converter'
     c_ignored_default = "0"
 
+    def parse_arg(self, argname):
+        if self.format_unit == 'n':
+            return """
+                {paramname} = PyNumber_AsSsize_t({argname}, PyExc_OverflowError);
+                if ({paramname} == -1 && PyErr_Occurred()) {{{{
+                    goto exit;
+                }}}}
+                """.format(argname=argname, paramname=self.name)
+        return super().parse_arg(argname)
+
 
 class float_converter(CConverter):
     type = 'float'
@@ -2699,12 +2986,32 @@
     format_unit = 'f'
     c_ignored_default = "0.0"
 
+    def parse_arg(self, argname):
+        if self.format_unit == 'f':
+            return """
+                {paramname} = (float) PyFloat_AsDouble({argname});
+                if (PyErr_Occurred()) {{{{
+                    goto exit;
+                }}}}
+                """.format(argname=argname, paramname=self.name)
+        return super().parse_arg(argname)
+
 class double_converter(CConverter):
     type = 'double'
     default_type = float
     format_unit = 'd'
     c_ignored_default = "0.0"
 
+    def parse_arg(self, argname):
+        if self.format_unit == 'd':
+            return """
+                {paramname} = PyFloat_AsDouble({argname});
+                if (PyErr_Occurred()) {{{{
+                    goto exit;
+                }}}}
+                """.format(argname=argname, paramname=self.name)
+        return super().parse_arg(argname)
+
 
 class Py_complex_converter(CConverter):
     type = 'Py_complex'
@@ -2712,6 +3019,16 @@
     format_unit = 'D'
     c_ignored_default = "{0.0, 0.0}"
 
+    def parse_arg(self, argname):
+        if self.format_unit == 'D':
+            return """
+                {paramname} = PyComplex_AsCComplex({argname});
+                if (PyErr_Occurred()) {{{{
+                    goto exit;
+                }}}}
+                """.format(argname=argname, paramname=self.name)
+        return super().parse_arg(argname)
+
 
 class object_converter(CConverter):
     type = 'PyObject *'
@@ -2773,9 +3090,28 @@
 
     def cleanup(self):
         if self.encoding:
-            name = ensure_legal_c_identifier(self.name)
+            name = self.name
             return "".join(["if (", name, ") {\n   PyMem_FREE(", name, ");\n}\n"])
 
+    def parse_arg(self, argname):
+        if self.format_unit == 's':
+            return """
+                if (!PyUnicode_Check({argname})) {{{{
+                    _PyArg_BadArgument("{{name}}", "str", {argname});
+                    goto exit;
+                }}}}
+                Py_ssize_t {paramname}_length;
+                {paramname} = PyUnicode_AsUTF8AndSize({argname}, &{paramname}_length);
+                if ({paramname} == NULL) {{{{
+                    goto exit;
+                }}}}
+                if (strlen({paramname}) != (size_t){paramname}_length) {{{{
+                    PyErr_SetString(PyExc_ValueError, "embedded null character");
+                    goto exit;
+                }}}}
+                """.format(argname=argname, paramname=self.name)
+        return super().parse_arg(argname)
+
 #
 # This is the fourth or fifth rewrite of registering all the
 # string converter format units.  Previous approaches hid
@@ -2829,16 +3165,52 @@
     format_unit = 'S'
     # accept = {bytes}
 
+    def parse_arg(self, argname):
+        if self.format_unit == 'S':
+            return """
+                if (!PyBytes_Check({argname})) {{{{
+                    _PyArg_BadArgument("{{name}}", "bytes", {argname});
+                    goto exit;
+                }}}}
+                {paramname} = ({type}){argname};
+                """.format(argname=argname, paramname=self.name, type=self.type)
+        return super().parse_arg(argname)
+
 class PyByteArrayObject_converter(CConverter):
     type = 'PyByteArrayObject *'
     format_unit = 'Y'
     # accept = {bytearray}
 
+    def parse_arg(self, argname):
+        if self.format_unit == 'Y':
+            return """
+                if (!PyByteArray_Check({argname})) {{{{
+                    _PyArg_BadArgument("{{name}}", "bytearray", {argname});
+                    goto exit;
+                }}}}
+                {paramname} = ({type}){argname};
+                """.format(argname=argname, paramname=self.name, type=self.type)
+        return super().parse_arg(argname)
+
 class unicode_converter(CConverter):
     type = 'PyObject *'
     default_type = (str, Null, NoneType)
     format_unit = 'U'
 
+    def parse_arg(self, argname):
+        if self.format_unit == 'U':
+            return """
+                if (!PyUnicode_Check({argname})) {{{{
+                    _PyArg_BadArgument("{{name}}", "str", {argname});
+                    goto exit;
+                }}}}
+                if (PyUnicode_READY({argname}) == -1) {{{{
+                    goto exit;
+                }}}}
+                {paramname} = {argname};
+                """.format(argname=argname, paramname=self.name)
+        return super().parse_arg(argname)
+
 @add_legacy_c_converter('u#', zeroes=True)
 @add_legacy_c_converter('Z', accept={str, NoneType})
 @add_legacy_c_converter('Z#', accept={str, NoneType}, zeroes=True)
@@ -2883,9 +3255,54 @@
         self.format_unit = format_unit
 
     def cleanup(self):
-        name = ensure_legal_c_identifier(self.name)
+        name = self.name
         return "".join(["if (", name, ".obj) {\n   PyBuffer_Release(&", name, ");\n}\n"])
 
+    def parse_arg(self, argname):
+        if self.format_unit == 'y*':
+            return """
+                if (PyObject_GetBuffer({argname}, &{paramname}, PyBUF_SIMPLE) != 0) {{{{
+                    goto exit;
+                }}}}
+                if (!PyBuffer_IsContiguous(&{paramname}, 'C')) {{{{
+                    _PyArg_BadArgument("{{name}}", "contiguous buffer", {argname});
+                    goto exit;
+                }}}}
+                """.format(argname=argname, paramname=self.name)
+        elif self.format_unit == 's*':
+            return """
+                if (PyUnicode_Check({argname})) {{{{
+                    Py_ssize_t len;
+                    const char *ptr = PyUnicode_AsUTF8AndSize({argname}, &len);
+                    if (ptr == NULL) {{{{
+                        goto exit;
+                    }}}}
+                    PyBuffer_FillInfo(&{paramname}, {argname}, (void *)ptr, len, 1, 0);
+                }}}}
+                else {{{{ /* any bytes-like object */
+                    if (PyObject_GetBuffer({argname}, &{paramname}, PyBUF_SIMPLE) != 0) {{{{
+                        goto exit;
+                    }}}}
+                    if (!PyBuffer_IsContiguous(&{paramname}, 'C')) {{{{
+                        _PyArg_BadArgument("{{name}}", "contiguous buffer", {argname});
+                        goto exit;
+                    }}}}
+                }}}}
+                """.format(argname=argname, paramname=self.name)
+        elif self.format_unit == 'w*':
+            return """
+                if (PyObject_GetBuffer({argname}, &{paramname}, PyBUF_WRITABLE) < 0) {{{{
+                    PyErr_Clear();
+                    _PyArg_BadArgument("{{name}}", "read-write bytes-like object", {argname});
+                    goto exit;
+                }}}}
+                if (!PyBuffer_IsContiguous(&{paramname}, 'C')) {{{{
+                    _PyArg_BadArgument("{{name}}", "contiguous buffer", {argname});
+                    goto exit;
+                }}}}
+                """.format(argname=argname, paramname=self.name)
+        return super().parse_arg(argname)
+
 
 def correct_name_for_self(f):
     if f.kind in (CALLABLE, METHOD_INIT):