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

[miss-islington]

miss-islington <mariatta.wijaya+miss-islington at gmail.com> added the comment:


New changeset 88970125e7a4917966f711dc7e93cf170977034f by Miss Islington (bot) in branch '3.10':
bpo-43977: Properly update the tp_flags of existing subclasses when their parents are registered (GH-26864)
https://github.com/python/cpython/commit/88970125e7a4917966f711dc7e93cf170977034f


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