[issue36974] Implement PEP 590

[Petr Viktorin]

New submission from Petr Viktorin <encukou at gmail.com>:


New changeset aacc77fbd77640a8f03638216fa09372cc21673d by Petr Viktorin (Jeroen Demeyer) in branch 'master':
bpo-36974: implement PEP 590 (GH-13185)
https://github.com/python/cpython/commit/aacc77fbd77640a8f03638216fa09372cc21673d


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<https://bugs.python.org/issue36974>
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