Patch by Xiang Zhang.

and iterables.  Speed up to 3 times for short objects.  Original patch by
Naoki Inada.

Patch by Xiang Zhang.

concatenations.  Patch by Xiang Zhang.

negative integer for resized bytearray.

For unknown reasons it perhaps caused a crash on 32-bit Windows (issue #).

file.

now return an instance of corresponding subclass.

Patch by Joe Jevnik.

to a template file.

to bytes_methods.c.

Argument Clinic is now able to infer all needed information.

Affected classes are generic sequence iterators, iterators of str, bytes,
bytearray, list, tuple, set, frozenset, dict, OrderedDict, corresponding
views and os.scandir() iterator.

Issue #26574: Optimize bytes.replace(b'', b'.') and
bytearray.replace(b'', b'.'): up to 80% faster. Patch written by Josh Snider.

Issue #26564.

Issue #26564: _PyObject_DebugDumpAddress() now dumps the traceback where a
memory block was allocated on memory block. Use the tracemalloc module to get
the traceback.

This allows sys.getsize() to work correctly with their subclasses with
__slots__ defined.

STRINGLIB(find_char) and STRINGLIB(rfind_char) that can be used independedly
without special preconditions.

Issue #25401: Optimize bytes.fromhex() and bytearray.fromhex(): they are now
between 2x and 3.5x faster. Changes:

* Use a fast-path working on a char* string for ASCII string
* Use a slow-path for non-ASCII string
* Replace slow hex_digit_to_int() function with a O(1) lookup in
  _PyLong_DigitValue precomputed table
* Use _PyBytesWriter API to handle the buffer
* Add unit tests to check the error position in error messages

Issue #25399: Don't create temporary bytes objects: modify _PyBytes_Format() to
create work directly on bytearray objects.

* Rename _PyBytes_Format() to _PyBytes_FormatEx() just in case if something
  outside CPython uses it
* _PyBytes_FormatEx() now uses (char*, Py_ssize_t) for the input string, so
  bytearray_format() doesn't need tot create a temporary input bytes object
* Add use_bytearray parameter to _PyBytes_FormatEx() which is passed to
  _PyBytesWriter, to create a bytearray buffer instead of a bytes buffer

Most formatting operations are now between 2.5 and 5 times faster.

for single-byte argument on Linux.

object now always allocates place for trailing null byte and it's buffer now
is always null-terminated.

PyObject_IsInstance(), PyObject_RichCompareBool() and _PyDict_Contains()
to check for and handle errors correctly.

Issue #23985: Fix a possible buffer overrun when deleting a slice from the front of a bytearray and then appending some other bytes data.

Patch by Martin Panter.

Also updates a few internal implementations of the same thing to use the
new built-in code.

Contributed by Arnon Yaari.

Windows has no memrchr() function.

This change is only a workaround, the optimization must be reenabled on other
platforms.

str.index, str.count, the in operator, str.split, str.partition) with
arguments of different kinds (UCS1, UCS2, UCS4).

and bytearray_getbuffer().  Both functions now raise BufferError in that
case.

and PyObject_AsWriteBuffer().