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Major version changes are for API compatibility. If there is a change which makes all other 3.* incompatible, then it should be a major version increase.

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You're describing something like semver, but Python doesn't do semver.

And this change would be fine even if Python did.

Who told you that? I'm looking at PEP 606, it says nothing like what you claim. https://www.python.org/dev/peps/pep-0606/

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