Fix a "gcc -pendatic" warning.

Patch by Xiang Zhang.

Patch by Xavier de Gaye.

Patch by Oren Milman.

The deprecation warning is emitted if __float__ returns an instance of
a strict subclass of float.  In a future versions of Python this can
be an error.

Patch by Xiang Zhang.

Patch by Demur Rumed.

Patch by Joe Jevnik.

with correct type.

Patch by Georg Brandl.

to a template file.

to bytes_methods.c.

pointer.

Argument Clinic is now able to infer all needed information.

Issue #26249: PyMem_Malloc() allocator family now uses the pymalloc allocator
rather than system malloc(). Applications calling PyMem_Malloc() without
holding the GIL can now crash: use PYTHONMALLOC=debug environment variable to
validate the usage of memory allocators in your application.

Isse #26516.

Based on patch by Xiang Zhang.

Return a bytearray object when bytearray is requested and when the small buffer
is used.

Fix also test_bytes: bytearray%args must return a bytearray type.