[issue43546] "Impossible" KeyError from importlib._bootstrap acquire line 110

[Anentropic]

Anentropic <ego at anentropic.com> added the comment:

https://docs.python.org/3/library/_thread.html#_thread.get_ident

> Thread identifiers may be recycled when a thread exits and another thread is created.

I still don't see how we get that KeyError but it feels like it might be something to do with this

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