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> Usually garbage collection will end up clearing the module's dict anyway.
This is not true, since global objects might have a __del__ and then hold the whole module dict alive through a reference cycle. Happily though, PEP 442 is going to make that concern obsolete.
As for the interpreter shutdown itself, I have a pending patch (post-PEP 442) to get rid of the globals cleanup as well. It may be better to merge the two approaches.