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I don't want to own this, but this is absolutely a release blocker. I see three ways out:
- Fix it right (if possible) -- "system immutable" types such as int should not allow __class__ assignment. Risk: there might be other cases (the code being patched is clearly too complex for humans to comprehend).
- Roll back the patch; I'm unclear on why Nathaniel would be so heartbroken if he couldn't assign the __class__ of a module (since there are other approaches such as assignment to sys.module[__name__].
- Roll back the patch but replace it with a narrower patch that specifically allows __class__ assignment for modules (but not for other types).
But first, why is it so important to assign the __class__ of a module? It seems somebody is trying to make modules into what they weren't meant to be.