Message 184085 - Python tracker

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Content 
Reproduced on Linux.
The reason is in Objects/typeobject.c: import_copyreg() has a static cache of the copyreg module.
When the interpreter stops, the module is filled with None... but gets reused in the next instance.

Resetting this "mod_copyreg" variable to NULL fixes the issue.
pickle is also broken for the same reason.