Issue #14775: Fix a potential quadratic dict build-up due to the garbage collector repeatedly trying to untrack dicts.
Additional comments by Tim Silk.

An issue in ctypes.c_longdouble, ctypes.c_double, and ctypes.c_float that
caused an incorrect exception to be returned in the case of overflow has been
fixed.

Patch by Roger Serwy.

Original patch by Roger Serwy.

even when parent window is closed. Patch by Roger Serwy.

Patch by Roger Serwy.

Fix suggested by Itay Brandes

Patch by Victor Stinner.

There's no bufsize argument anymore, and os.fdopen() is only a very
thin wrapper around open() anymore. Change the documentation to
reflect that.

Patch by Matej Cepl.

Reverts some changes of d13fdd97cc8e.

`versionchanged` tags about 2.7 are useless in 3.x branches.

It doesn't get called on 'null', 'true', 'false' since f686aced02a3.

 Issue #14426: Correct the Date format in Expires attribute of Set-Cookie. Patch by Federico Reghenzani and Müte Invert

Closes #14842.

The behaviour of the parse_constant callback changed insofar that 'null',
'true', 'false' don't trigger its call anymore.

Patch by Serhiy Storchaka