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Hi, thanks for this first PR! I'm not a core developer, so please take my 2 cents with some skepticism 😉

The change you suggested is correct for Python versions 3.8 and below, but has been deprecated in many of the typing types since Python 3.9. You can read more about the new type introduced in Python 3.9 here. The TLDR is that most container classes in the standard library can now be used for type annotations. As such, IMO collections.abc.Callable is correct. This was a deliberate change in commit d9ab95f.

If you want to read up the old docs, you can switch the Python version in the top left corner of the page: Python 3.8 imports Callable from typing , whilst Python 3.9 and onwards doesn't. There's a note about it in the 3.9 documentation here that it's deprecated.

Once again, thanks for taking the time to make this PR!

Thanks a lot @Fidget-Spinner I didn't know