[issue34410] itertools.tee not thread-safe; can segfault interpreter when wrapped iterator releases GIL

[Xiang Zhang]

Xiang Zhang <angwerzx at 126.com> added the comment:

I could. But currently I don't have a good idea how to fix it elegantly. If anyone else makes a PR, I'm willing to review it.

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stage:  -> needs patch
versions: +Python 3.8

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