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If you write to the (very extensive) standard library, though, none of this is an issue.

Bullshit, Python breaks compatibility between minor releases all the time. The script you wrote for 3.8 has high chance of being broken on 3.11.

Really? I've written a lot of python, though less recently, and this doesn't sound familiar at all. What's in 3.8 but not 3.11?