[issue18214] Stop purging modules which are garbage collected before shutdown

[Richard Oudkerk]

Richard Oudkerk added the comment:

Yes, I agree the patch is ok.

It would be would be much simpler to keep track of the module dicts if 
they were weakrefable.  Alternatively, at shutdown a weakrefable object 
with a reference to the module dict could be inserted in to each module 
dict.  We could then use those to find orphaned module dicts.  But I 
doubt it is worth the extra effort.

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