tox 4 usually hangs when I run tests locally

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This is not our bug, but I'm opening it to track the interaction here.

I think it might already be filed upstream as this — tox-dev/tox#2844 but the symptom is hard to nail down exactly. From ps/pgrep/pstree output it looks like the test process in the environment is never started, but the console shows it as if it's running forever. I left one overnight to make sure it wasn't a zealous timeout.

I switched back to tox 3 for my local use, and thankfully none of the tox.ini changes we made to upgrade seem to have negatively affected old versions, so I'm going to stick with that. It doesn't seem to have any issues in CI, so perhaps the bug is macOS specific?

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Mainly I wanted to open this to ensure that we don't start depending on any tox 4 features and make this workaround impossible. Although maybe it's time to switch to nox