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I am sorry, but I don't see why we need to have .mypy_cache in the .gitignore file...

As @brettcannon has said, you have to modify your global .gitignore and not the .gitignore of this project.

Have a nice day,

There is already an open PR here that passes CI #6614. I also don't understand why this is needed?

Closing this as a duplicate of #6614.