[issue36780] Interpreter exit blocks waiting for futures of shut-down ThreadPoolExecutors

[SilentGhost]

Change by SilentGhost <ghost.adh at runbox.com>:


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nosy: +bquinlan, pitrou
type:  -> behavior
versions:  -Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36780>
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