I'm currently writing the v0.2 -> v0.3 upgrade guide and realizing we still have the name Range for our default impl of VersionSet. However, this is not exactly the same as the previous v0.2 Range.
So to prevent user confusion, and also make the upgrade guide clearer, I'd suggest we rename it to BoundedRange.
That's also more precise since it's a range built with inclusive/exclusive bounds.