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So I tried out the hermetic python stuff. Really cool addition! I set my interpreter constraints to `CPython==3.8.10` and saw it installing python for me. When I went looking, I saw `3.8.16` in `~/.cache/pants/named_caches/pyenv`. What actually controls the version?

One thing I'm trying out now is that I didn't update my lockfile generation with the new constraint. We used to have `&gt;=3.8,&lt;3.9`.

Changing the constraints used to generate the lockfile did not trigger a new installation. It was still using `3.8.16`

Wiping `named_caches/pyenv` to force a new install didn't seem to change anything

<https://github.com/pantsbuild/pants/blob/main/src/python/pants/backend/python/providers/pyenv/rules.py#L237-L239|https://github.com/pantsbuild/pants/blob/main/src/python/pants/backend/python/providers/pyenv/rules.py#L237-L239>

Grep for `PythonProvider` for the plumbing