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> If we have static types, that means there is a mechanism to share some objects across interpreters.
Sharing objects between interpreters is bad and is causing complex bugs. See a recent example of an object traveling from one interpreter to another and then causing a random crash on Windows related to the garbage collector:
* https://bugs.python.org/issue46070
* https://github.com/python/cpython/pull/30577#pullrequestreview-852106207
> And if that's the case, why can't small ints (like sys.float_info.n_unnamed_fields) be static & shared as well?
I would prefer to discuss that in other issues like bpo-40255 or bpo-39511, and focus this issue on fixing the static types implementation when Python is embedded in an application.
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Hum, this issue is not really related to sub-interpreters. My proposed PR only changes Py_Finalize(): the main interpreter.