I have multiple versions of Python built from source. If I want to test what my code will do on a given version, I spin up a new venv (near instantaneous using `--without-pip`, which I achieve via a small Bash wrapper) and try installing it (using the `--python` option to Pip, through another wrapper, allowing me to reuse a single global copy).

No matter what tooling you have, that kind of test is really the only way to be sure anyway.

If something doesn't work, I can play around with dependency versions and/or do the appropriate research to figure out what's required for a given Python version, then give the necessary hints in my `pyproject.toml` (https://packaging.python.org/en/latest/specifications/pyproj...) as environment markers on my dependency strings (https://peps.python.org/pep-0508/#environment-markers).

"Mysterious errors" in this area are usually only mysterious to end users.