I love tox and I use it daily, but it stands to reason that its maintainers are unfamiliar with #xkcd1172.

By the time you're at version .56 of your current major release, the behaviour you changed in .0 is no longer "incorrect"; it's a default that has changed compared to a legacy version.

https://tox.wiki/en/latest/changelog.html#bug-fixes-4-56-0