I'm a little confused with how the version selection works with the pyenv provider. In the rule I see we call

python_to_use = request.interpreter_constraints.minimum_python_version

, but empirical a constraint like

CPython==3.10.*"

results in

3.10.10

showing up in

named_caches

. Which is... the maximum version?

Usually, you want the maximum bugfix version of the lowest compatible major/minor. There's a bug in the pyenv backend for the latter part, but the former part is true and works

As in if my interpreter constraint was >=3.8.0,<3.10 I "should" get 3.8.latest, but will get 3.9.latest?

I think so yeah, you SHOULD get 3.8.latest