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Jeong, YunWon
85eca218af
* Fix atexit unraisable exception message format
Match PyErr_FormatUnraisable behavior: use
"Exception ignored in atexit callback {func!r}" as err_msg
and pass None as object instead of the callback function.
* Fix atexit unregister deadlock with reentrant __eq__
Release the lock during equality comparison in unregister so
that __eq__ can safely call atexit.unregister or atexit._clear.
Store callbacks in LIFO order (insert at front) and use
identity-based search after comparison to handle list mutations,
matching atexitmodule.c behavior.
Also pass None as err_msg when func.repr() fails, matching
CPython's PyErr_FormatUnraisable fallback.