Thank you. I've rebased and merged your PR on the 0.22-bufix branch. In main, we can get rid of typing_extensions since Python 3.6 support was removed.

Ah, that won't work. Literal was only added in 3.8.

oof, sorry about introducing Literal, I should have left it as bool or whatever

For __exit__, Literal[False] is actually recommended. So it's fine. 0.22.1 has been released to add the dependency on typeing_extensions.