(continuing discussion from that PR)

Still tox.ini still references py3.7. Seems CI does not use tox.ini environment list, which is confusing

I found the entire gh-actions part of tox.ini to be confusing. It looks like the colons on the left are some environmental variable set by CI and the thing on the right tells tox what interpreter that envar maps to.

The "envlist" at the top is all the versions tox will iterate through by default. The CI only installs one version of Python on each machine, so yeah. It does seem pretty reasonable to stop testing it by default, though.