[issue24912] The type of cached objects is mutable

[Eugene Toder]

Eugene Toder added the comment:

Nathaniel, what if we allow creating module objects from an existing dict instead of always creating a new one. Does this solve your namespace diversion problem?

FWIW, when I discovered this change I was quite surprised this came through without a PEP. I agree that the old rules were somewhat arbitrary, but this is a significant change with non-trivial compatibility concerns.

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