Message 394374 - Python tracker

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> The _PyImport_FixupExtensionObject() change impacts extensions using the legacy API and so should not be used in subinterpreters.

I'm not using that directly in my code, but I guess it's used indirectly? If it shouldn't be used, what's the alternative in 3.9?

> Maybe the old behavior was better: if an extension uses the old API, share its state between all interpreters.

Since this worked fine as far as I know before 3.9, and currently breaks existing applications, this is probably better yes.