[issue36974] Implement PEP 590

[Jeroen Demeyer]

Change by Jeroen Demeyer <J.Demeyer at UGent.be>:


----------
pull_requests: +14578
pull_request: https://github.com/python/cpython/pull/14782

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36974>
_______________________________________