uv supports PyPI, which still has packages that are Python-2-only. So even if you're running python 3.8, it seems possible to try to declare a dependency on som

uv supports PyPI, which still has packages that are Python-2-only. So even if you're running python 3.8, it seems possible to try to declare a dependency on some <3.0 code from PyPI. That means it's an error they should detect.