[issue36842] Implement PEP 578

[Steve Dower]

Steve Dower <steve.dower at python.org> added the comment:

test_gdb failed on the Debian PGO buildbot

https://buildbot.python.org/all/#builders/47/builds/2854

I'm going to do what I can to investigate, but I may be out of my depth here!

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stage: patch review -> commit review

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