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[3.13] gh-137017: Ensure `Thread.is_alive()` only returns False after the underlying OS thread exits (gh-137315) (gh-138917)

(cherry picked from commit aa9ceb17215af21ed6618d6f7ccb5bf57ca57101)

Co-authored-by: Abdul <abdulrasheedibrahim47@gmail.com>
Co-authored-by: Sam Gross <colesbury@gmail.com>
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Miss Islington (bot) committed
7160f9f5d8ec6597a1a5bd070b498bb890b8a790
Parent: 2fd8f03
Committed by GitHub <noreply@github.com> on 9/15/2025, 1:28:05 PM