> Do you expect to make the higher level workflow independent of requirements.txt / support a platform-agnostic lockfile? Being attached to Rye makes me think "no".

Yes, we absolutely do. We don't do this today, the initial scope is intentionally limited. But in the next phase of the project, we want to extend to multi-platform and multi-version resolution.

> How are you handling pre-releases in you resolution? Unsure how much of that is specified in PEPs. Its something that Cargo is weak in today but we're slowly improving.

This is something we talked with Jacob about quite a bit. Turns out (as you know) it's a very hard problem. For the initial release, we added a constraint: our default behavior is that if you want to use a pre-release, you _have_ to specify the package as a first-party dependency and use a pre-release marker in the version specifier. (We also support globally enabling and disabling pre-releases.) So, we basically don't support "transitive" pre-releases right now -- but we give you a dedicated error message if your resolution fails for that reason.