[3.13] gh-127791: Fix, document, and test PyUnstable_AtExit
(GH-127793)#127819
Merged
vstinner merged 4 commits intopython:3.13from ZeroIntensity:backport-d5d84c3-3.13Dec 11, 2024
+73-38
PyUnstable_AtExit
(GH-127793)#127819