Thanks, this is great! 😻 I pushed a commit for trivial naming nitpicks, and verified that there's a significant speedup for empty comparisons (I observed 1.7x, from 37.4 ns down to 22.0 ns).

We merge PRs to our GitHub and MSVC-internal repos simultaneously in a semi-manual process, batched up to save time. Your PR will be part of the next batch. I'll post comments here as I prepare this for merging!

I'm mirroring this to the MSVC-internal repo - please notify me if any further changes are pushed.

Thanks for this significant performance improvement - it's a small change but it affects extremely common operations (both string and string_view). Amazing for a first-time contribution! 😻 🚀 🎉

This is expected to ship in VS 2022 17.12 Preview 3.