[issue43977] Implement the latest semantics for PEP 634 for matching collections

[Brandt Bucher]

Brandt Bucher <brandtbucher at gmail.com> added the comment:


New changeset ca2009d72a52a98bf43aafa9ad270a4fcfabfc89 by Brandt Bucher in branch 'main':
bpo-43977: Properly update the tp_flags of existing subclasses when their parents are registered (GH-26864)
https://github.com/python/cpython/commit/ca2009d72a52a98bf43aafa9ad270a4fcfabfc89


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