I reopen the issue. I'm not comfortable with the backport.

For me, this change is not a bugfix, but a new feature. It can break applications which rely on the exact error message in their test suite. I'm not sure why it was backported to Python 3.9. Moreover, I'm not comfortable to backport it to 3.10.1 and not 3.10.0.

I would prefer to only change the behavior in Python 3.11. If you want to get it in 3.10, I suggest to convince Pablo to get in 3.10.0.

Otherwise, I suggest to revert it in 3.9 and 3.10.

Well, the qualified name is usually the same than the short name, so only few applications should be impacted. But it's annoying when the Python behavior changes in a minor version (3.x.y).