I wasn't aware of that, that's actually insane. It's odd to me that it took so long to get f-strings and Enums right in Python, I assumed those would be pretty easy language features to implement.

I know that Python 3.11 added some things, like StrEnum; those obviously won't work on older Python versions. But I'm not aware of things that work in a certain Python 3 version but don't work in newer ones. You're even talking about incompatibilities between different 3.11.x versions? Can you give some more detail on that?