Hi @thomasjpfan, thank you very much for the review! :)

I was looking at the point 4 of the Contributing Guide - How to contribute:

Install the development dependencies:
pip install pytest pytest-cov flake8 mypy numpydoc black==22.3.0

Here black is pinned (and I have not updated it in the .pre-commit-config.yaml), but flake8 is not.
I thought that flake8 in the pre-commit may potentially return different results compared to git diff upstream/main -u -- "*.py" | flake8 --diff, in case the flake8 versions are not matching.
But you are right, it seems that the behaviour has not changed.

I expect flake8 to be a bit more stable compared to black. We use black with preview = true:

which is more prone to formatting changes. Formatting changes from a black version update can lead to more work for contributors to sync their PR with main. We pin black's version to avoid this issue.

Thanks a lot, merging!