Simplified testing for null characters in __name__ setter.

Patch by John Walker.

independedly from the type of the wrapped object (by returning the original
object unchanged).

Thanks to Alejandro Santos for the bug report and Anish Shah for the
patch.

Thanks to Chris Wilcox for the initial patch.

This patch is manually crafted and contains changes that couldn't be handled
automatically.

The patch is automatically generated, it replaces the code that uses Py_CLEAR.

subclasses of list or dict and haven't implemented any pickle-related
methods (__reduce__, __reduce_ex__, __getnewargs__, __getnewargs_ex__,
or __getstate__), can no longer be pickled.  Including memoryview.

macro Py_SETREF.

Patch includes contributions by Isobel Hooper, incorporating suggestions from
Paul Winkler.  Reviewed by Martin Panter.

In addition to accepting the corrections for the RFC compliance wording, I
went through and corrected all the argument and return types, and made the
pattern of how the arguments and return types are documented consistent.
So, this patch also addresses #20782, though I had forgotten about that issue
and its patch.

os.fwalk() parameter names.

Original patch by Samson Lee.

Added tests for dict views iterators.

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

to ASCII replacements.  Original patch by Chris Angelico.

Added test for return code for the last RegQueryValueExW.