[issue39042] Use the runtime's main thread ID in the threading module.

[Łukasz Langa]

Łukasz Langa <lukasz at langa.pl> added the comment:

I agree this should be fixed. Since we've already released 3.8.1 and 3.8.2 with this behavior it's hard to justify blocking releases on this, though.

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priority: release blocker -> high

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39042>
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