uv

8071a238 - Add dedicated ID types to avoid opaque strings (#642)

Add dedicated ID types to avoid opaque strings (#642) This allows us to enforce type safety within the resolver. For example, in the index, we can remove `String` as a key type and enforce that callers _must_ present us with a `PackageId`. (This actually caught one bug, where we were using the SHA rather than the package ID. That bug shouldn't have had any effect given where it was, since those are 1:1, but it's still problematic.)