….__init__ (pythonGH-153142)

Fix default argument for segment_names in _SharedMemoryTracker constructor to not use a mutable list.

Adds authentication using PLAIN SASL mechanism.

This is a plain-text authentication mechanism which can be used
instead of IMAP4.login() when UTF-8 support is required.

…uilds (pythonGH-151651)

* pythongh-82151: Update and improve urlsplit docstring

Co-authored-by: idomic <michael.ido@gmail.com>

* Slightly improved wording for % escapes. Consistent with rest of the doc.

---------

Co-authored-by: idomic <michael.ido@gmail.com>
Co-authored-by: Senthil Kumaran <senthil@python.org>

…153160)

Replace the state->repeat checks that guard mark saving and restoring
with an explicit save_marks counter maintained where repeat and
possessive contexts are entered and left.  Each push is now paired
with a pop decided by the same condition.

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>