diff --git a/Modules/_datetimemodule.c b/Modules/_datetimemodule.c
index 91456e9..13c4ecc 100644
--- a/Modules/_datetimemodule.c
+++ b/Modules/_datetimemodule.c
@@ -4167,10 +4167,10 @@
     {"now", (PyCFunction)datetime_datetime_now, METH_VARARGS|METH_KEYWORDS|METH_CLASS, datetime_datetime_now__doc__},
 
 static PyObject *
-datetime_datetime_now_impl(PyObject *cls, PyObject *tz);
+datetime_datetime_now_impl(PyTypeObject *cls, PyObject *tz);
 
 static PyObject *
-datetime_datetime_now(PyObject *cls, PyObject *args, PyObject *kwargs)
+datetime_datetime_now(PyTypeObject *cls, PyObject *args, PyObject *kwargs)
 {
     PyObject *return_value = NULL;
     static char *_keywords[] = {"tz", NULL};
@@ -4187,8 +4187,8 @@
 }
 
 static PyObject *
-datetime_datetime_now_impl(PyObject *cls, PyObject *tz)
-/*[clinic checksum: cde1daca68c9b7dca6df51759db2de1d43a39774]*/
+datetime_datetime_now_impl(PyTypeObject *cls, PyObject *tz)
+/*[clinic checksum: 5e61647d5d1feaf1ab096c5406ccea17bb7b061c]*/
 {
     PyObject *self;
 
@@ -4198,7 +4198,7 @@
     if (check_tzinfo_subclass(tz) < 0)
         return NULL;
 
-    self = datetime_best_possible(cls,
+    self = datetime_best_possible((PyObject *)cls,
                                   tz == Py_None ? localtime : gmtime,
                                   tz);
     if (self != NULL && tz != Py_None) {
diff --git a/Modules/_dbmmodule.c b/Modules/_dbmmodule.c
index 7772b49..10f872d 100644
--- a/Modules/_dbmmodule.c
+++ b/Modules/_dbmmodule.c
@@ -43,6 +43,20 @@
 
 static PyObject *DbmError;
 
+/*[clinic]
+module dbm
+class dbm.dbm
+[clinic]*/
+/*[clinic checksum: da39a3ee5e6b4b0d3255bfef95601890afd80709]*/
+
+/*[python]
+class dbmobject_converter(self_converter):
+    type = "dbmobject *"
+    def converter_init(self):
+        self.name = 'dp'
+[python]*/
+/*[python checksum: da39a3ee5e6b4b0d3255bfef95601890afd80709]*/
+
 static PyObject *
 newdbmobject(const char *file, int flags, int mode)
 {
@@ -248,27 +262,77 @@
     0,                          /* sq_inplace_repeat */
 };
 
-static PyObject *
-dbm_get(dbmobject *dp, PyObject *args)
-{
-    datum key, val;
-    PyObject *defvalue = Py_None;
-    char *tmp_ptr;
-    Py_ssize_t tmp_size;
+/*[clinic]
 
-    if (!PyArg_ParseTuple(args, "s#|O:get",
-                          &tmp_ptr, &tmp_size, &defvalue))
-        return NULL;
-    key.dptr = tmp_ptr;
-    key.dsize = tmp_size;
+dbm.dbm.get
+
+    self: dbmobject
+
+    key: str(length=True)
+    [
+    default: object
+    ]
+    /
+
+Return the value for key if present, otherwise default.
+[clinic]*/
+
+PyDoc_STRVAR(dbm_dbm_get__doc__,
+"Return the value for key if present, otherwise default.\n"
+"\n"
+"dbm.dbm.get(key, [default])");
+
+#define DBM_DBM_GET_METHODDEF    \
+    {"get", (PyCFunction)dbm_dbm_get, METH_VARARGS, dbm_dbm_get__doc__},
+
+static PyObject *
+dbm_dbm_get_impl(dbmobject *dp, const char *key, Py_ssize_clean_t key_length, int group_right_1, PyObject *default_value);
+
+static PyObject *
+dbm_dbm_get(PyObject *self, PyObject *args)
+{
+    PyObject *return_value = NULL;
+    const char *key;
+    Py_ssize_clean_t key_length;
+    int group_right_1 = 0;
+    PyObject *default_value = NULL;
+
+    switch (PyTuple_Size(args)) {
+        case 1:
+            if (!PyArg_ParseTuple(args, "s#:get", &key, &key_length))
+                return NULL;
+            break;
+        case 2:
+            if (!PyArg_ParseTuple(args, "s#O:get", &key, &key_length, &default_value))
+                return NULL;
+            group_right_1 = 1;
+            break;
+        default:
+            PyErr_SetString(PyExc_TypeError, "dbm.dbm.get requires 1 to 2 arguments");
+            return NULL;
+    }
+    return_value = dbm_dbm_get_impl((dbmobject *)self, key, key_length, group_right_1, default_value);
+
+    return return_value;
+}
+
+static PyObject *
+dbm_dbm_get_impl(dbmobject *dp, const char *key, Py_ssize_clean_t key_length, int group_right_1, PyObject *default_value)
+/*[clinic checksum: 5b4265e66568f163ef0fc7efec09410eaf793508]*/
+{
+    datum dbm_key, val;
+
+    if (!group_right_1)
+        default_value = Py_None;
+    dbm_key.dptr = (char *)key;
+    dbm_key.dsize = key_length;
     check_dbmobject_open(dp);
-    val = dbm_fetch(dp->di_dbm, key);
+    val = dbm_fetch(dp->di_dbm, dbm_key);
     if (val.dptr != NULL)
         return PyBytes_FromStringAndSize(val.dptr, val.dsize);
-    else {
-        Py_INCREF(defvalue);
-        return defvalue;
-    }
+
+    Py_INCREF(default_value);
+    return default_value;
 }
 
 static PyObject *
@@ -333,9 +397,7 @@
      "close()\nClose the database."},
     {"keys",            (PyCFunction)dbm_keys,          METH_NOARGS,
      "keys() -> list\nReturn a list of all keys in the database."},
-    {"get",             (PyCFunction)dbm_get,           METH_VARARGS,
-     "get(key[, default]) -> value\n"
-     "Return the value for key if present, otherwise default."},
+    DBM_DBM_GET_METHODDEF
     {"setdefault",      (PyCFunction)dbm_setdefault,    METH_VARARGS,
      "setdefault(key[, default]) -> value\n"
      "Return the value for key if present, otherwise default.  If key\n"
@@ -379,7 +441,6 @@
 /* ----------------------------------------------------------------- */
 
 /*[clinic]
-module dbm
 
 dbm.open as dbmopen
 
@@ -415,10 +476,10 @@
     {"open", (PyCFunction)dbmopen, METH_VARARGS, dbmopen__doc__},
 
 static PyObject *
-dbmopen_impl(PyObject *module, const char *filename, const char *flags, int mode);
+dbmopen_impl(PyModuleDef *module, const char *filename, const char *flags, int mode);
 
 static PyObject *
-dbmopen(PyObject *module, PyObject *args)
+dbmopen(PyModuleDef *module, PyObject *args)
 {
     PyObject *return_value = NULL;
     const char *filename;
@@ -436,8 +497,8 @@
 }
 
 static PyObject *
-dbmopen_impl(PyObject *module, const char *filename, const char *flags, int mode)
-/*[clinic checksum: 2b0ec9e3c6ecd19e06d16c9f0ba33848245cb1ab]*/
+dbmopen_impl(PyModuleDef *module, const char *filename, const char *flags, int mode)
+/*[clinic checksum: c1f2036017ec36a43ac6f59893732751e67c19d5]*/
 {
     int iflags;
 
diff --git a/Modules/_weakref.c b/Modules/_weakref.c
index 771639d..af845ff 100644
--- a/Modules/_weakref.c
+++ b/Modules/_weakref.c
@@ -25,10 +25,10 @@
     {"getweakrefcount", (PyCFunction)_weakref_getweakrefcount, METH_O, _weakref_getweakrefcount__doc__},
 
 static Py_ssize_t
-_weakref_getweakrefcount_impl(PyObject *module, PyObject *object);
+_weakref_getweakrefcount_impl(PyModuleDef *module, PyObject *object);
 
 static PyObject *
-_weakref_getweakrefcount(PyObject *module, PyObject *object)
+_weakref_getweakrefcount(PyModuleDef *module, PyObject *object)
 {
     PyObject *return_value = NULL;
     Py_ssize_t _return_value;
@@ -42,8 +42,8 @@
 }
 
 static Py_ssize_t
-_weakref_getweakrefcount_impl(PyObject *module, PyObject *object)
-/*[clinic checksum: 05cffbc3a4b193a0b7e645da81be281748704f69]*/
+_weakref_getweakrefcount_impl(PyModuleDef *module, PyObject *object)
+/*[clinic checksum: 015113be0c9a0a8672d35df10c63e3642cc23da4]*/
 {
     PyWeakReference **list;
 
diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index 4c96204..9143fea 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -2460,10 +2460,10 @@
     {"stat", (PyCFunction)os_stat, METH_VARARGS|METH_KEYWORDS, os_stat__doc__},
 
 static PyObject *
-os_stat_impl(PyObject *module, path_t *path, int dir_fd, int follow_symlinks);
+os_stat_impl(PyModuleDef *module, path_t *path, int dir_fd, int follow_symlinks);
 
 static PyObject *
-os_stat(PyObject *module, PyObject *args, PyObject *kwargs)
+os_stat(PyModuleDef *module, PyObject *args, PyObject *kwargs)
 {
     PyObject *return_value = NULL;
     static char *_keywords[] = {"path", "dir_fd", "follow_symlinks", NULL};
@@ -2485,8 +2485,8 @@
 }
 
 static PyObject *
-os_stat_impl(PyObject *module, path_t *path, int dir_fd, int follow_symlinks)
-/*[clinic checksum: 89390f78327e3f045a81974d758d3996e2a71f68]*/
+os_stat_impl(PyModuleDef *module, path_t *path, int dir_fd, int follow_symlinks)
+/*[clinic checksum: b08112eff0ceab3ec2c72352da95ce73f245d104]*/
 {
     return posix_do_stat("stat", path, dir_fd, follow_symlinks);
 }
@@ -2600,10 +2600,10 @@
     {"access", (PyCFunction)os_access, METH_VARARGS|METH_KEYWORDS, os_access__doc__},
 
 static PyObject *
-os_access_impl(PyObject *module, path_t *path, int mode, int dir_fd, int effective_ids, int follow_symlinks);
+os_access_impl(PyModuleDef *module, path_t *path, int mode, int dir_fd, int effective_ids, int follow_symlinks);
 
 static PyObject *
-os_access(PyObject *module, PyObject *args, PyObject *kwargs)
+os_access(PyModuleDef *module, PyObject *args, PyObject *kwargs)
 {
     PyObject *return_value = NULL;
     static char *_keywords[] = {"path", "mode", "dir_fd", "effective_ids", "follow_symlinks", NULL};
@@ -2627,8 +2627,8 @@
 }
 
 static PyObject *
-os_access_impl(PyObject *module, path_t *path, int mode, int dir_fd, int effective_ids, int follow_symlinks)
-/*[clinic checksum: aa3e145816a748172e62df8e44af74169c7e1247]*/
+os_access_impl(PyModuleDef *module, path_t *path, int mode, int dir_fd, int effective_ids, int follow_symlinks)
+/*[clinic checksum: b9f8ececb061d31b64220c29526bfee642d1b602]*/
 {
     PyObject *return_value = NULL;
 
@@ -2734,10 +2734,10 @@
     {"ttyname", (PyCFunction)os_ttyname, METH_VARARGS, os_ttyname__doc__},
 
 static char *
-os_ttyname_impl(PyObject *module, int fd);
+os_ttyname_impl(PyModuleDef *module, int fd);
 
 static PyObject *
-os_ttyname(PyObject *module, PyObject *args)
+os_ttyname(PyModuleDef *module, PyObject *args)
 {
     PyObject *return_value = NULL;
     int fd;
@@ -2757,8 +2757,8 @@
 }
 
 static char *
-os_ttyname_impl(PyObject *module, int fd)
-/*[clinic checksum: c742dd621ec98d0f81d37d264e1d3c89c7a5fb1a]*/
+os_ttyname_impl(PyModuleDef *module, int fd)
+/*[clinic checksum: 61e4e525984cb293f949ccae6ae393c0011dfe8e]*/
 {
     char *ret;
 
diff --git a/Modules/zlibmodule.c b/Modules/zlibmodule.c
index 8fdc239..b223aa7 100644
--- a/Modules/zlibmodule.c
+++ b/Modules/zlibmodule.c
@@ -81,6 +81,13 @@
         PyErr_Format(ZlibError, "Error %d %s: %.200s", err, msg, zmsg);
 }
 
+/*[clinic]
+module zlib
+class zlib.Compress
+class zlib.Decompress
+[clinic]*/
+/*[clinic checksum: da39a3ee5e6b4b0d3255bfef95601890afd80709]*/
+
 PyDoc_STRVAR(compressobj__doc__,
 "compressobj(level=-1, method=DEFLATED, wbits=15, memlevel=8,\n"
 "            strategy=Z_DEFAULT_STRATEGY[, zdict])\n"
@@ -157,32 +164,86 @@
     PyMem_RawFree(ptr);
 }
 
-PyDoc_STRVAR(compress__doc__,
-"compress(string[, level]) -- Returned compressed string.\n"
+/*[clinic]
+zlib.compress
+    bytes: Py_buffer
+        Binary data to be compressed.
+    [
+    level: int
+        Compression level, in 0-9.
+    ]
+    /
+
+Returns compressed string.
+
+[clinic]*/
+
+PyDoc_STRVAR(zlib_compress__doc__,
+"Returns compressed string.\n"
 "\n"
-"Optional arg level is the compression level, in 0-9.");
+"zlib.compress(bytes, [level])\n"
+"  bytes\n"
+"    Binary data to be compressed.\n"
+"  level\n"
+"    Compression level, in 0-9.");
+
+#define ZLIB_COMPRESS_METHODDEF    \
+    {"compress", (PyCFunction)zlib_compress, METH_VARARGS, zlib_compress__doc__},
 
 static PyObject *
-PyZlib_compress(PyObject *self, PyObject *args)
+zlib_compress_impl(PyModuleDef *module, Py_buffer *bytes, int group_right_1, int level);
+
+static PyObject *
+zlib_compress(PyModuleDef *module, PyObject *args)
+{
+    PyObject *return_value = NULL;
+    Py_buffer bytes;
+    int group_right_1 = 0;
+    int level = 0;
+
+    switch (PyTuple_Size(args)) {
+        case 1:
+            if (!PyArg_ParseTuple(args, "y*:compress", &bytes))
+                return NULL;
+            break;
+        case 2:
+            if (!PyArg_ParseTuple(args, "y*i:compress", &bytes, &level))
+                return NULL;
+            group_right_1 = 1;
+            break;
+        default:
+            PyErr_SetString(PyExc_TypeError, "zlib.compress requires 1 to 2 arguments");
+            return NULL;
+    }
+    return_value = zlib_compress_impl(module, &bytes, group_right_1, level);
+
+    /* Cleanup for bytes */
+    if (bytes.buf)
+       PyBuffer_Release(&bytes);
+
+    return return_value;
+}
+
+static PyObject *
+zlib_compress_impl(PyModuleDef *module, Py_buffer *bytes, int group_right_1, int level)
+/*[clinic checksum: 03e857836db25448d4d572da537eb7faf7695d71]*/
 {
     PyObject *ReturnVal = NULL;
-    Py_buffer pinput;
     Byte *input, *output = NULL;
     unsigned int length;
-    int level=Z_DEFAULT_COMPRESSION, err;
+    int err;
     z_stream zst;
 
-    /* require Python string object, optional 'level' arg */
-    if (!PyArg_ParseTuple(args, "y*|i:compress", &pinput, &level))
-        return NULL;
+    if (!group_right_1)
+        level = Z_DEFAULT_COMPRESSION;
 
-    if ((size_t)pinput.len > UINT_MAX) {
+    if ((size_t)bytes->len > UINT_MAX) {
         PyErr_SetString(PyExc_OverflowError,
                         "Size does not fit in an unsigned int");
         goto error;
     }
-    input = pinput.buf;
-    length = (unsigned int)pinput.len;
+    input = bytes->buf;
+    length = (unsigned int)bytes->len;
 
     zst.avail_out = length + length/1000 + 12 + 1;
 
@@ -239,7 +300,6 @@
         zlib_error(zst, err, "while finishing compression");
 
  error:
-    PyBuffer_Release(&pinput);
     PyMem_Free(output);
 
     return ReturnVal;
@@ -682,10 +742,6 @@
 }
 
 /*[clinic]
-
-module zlib
-class zlib.Decompress
-
 zlib.Decompress.decompress
 
     data: Py_buffer
@@ -739,14 +795,15 @@
 
 exit:
     /* Cleanup for data */
-    PyBuffer_Release(&data);
+    if (data.buf)
+       PyBuffer_Release(&data);
 
     return return_value;
 }
 
 static PyObject *
 zlib_Decompress_decompress_impl(PyObject *self, Py_buffer *data, unsigned int max_length)
-/*[clinic checksum: 76ca9259e3f5ca86bae9da3d0e75637b5d492234]*/
+/*[clinic checksum: f83e91728d327462d7ccbee95299514f26b92253]*/
 {
     compobject *zself = (compobject *)self;
     int err;
@@ -966,8 +1023,6 @@
 #ifdef HAVE_ZLIB_COPY
 
 /*[clinic]
-
-class zlib.Compress
 zlib.Compress.copy
 
 Return a copy of the compression object.
@@ -1295,8 +1350,7 @@
 {
     {"adler32", (PyCFunction)PyZlib_adler32, METH_VARARGS,
                 adler32__doc__},
-    {"compress", (PyCFunction)PyZlib_compress,  METH_VARARGS,
-                 compress__doc__},
+    ZLIB_COMPRESS_METHODDEF
     {"compressobj", (PyCFunction)PyZlib_compressobj, METH_VARARGS|METH_KEYWORDS,
                     compressobj__doc__},
     {"crc32", (PyCFunction)PyZlib_crc32, METH_VARARGS,