@ricejasonf The feedback to papers is private on the Committee wiki. Technically, the papers themselves are supposed to be private to the committee, but WG21 does things differently (fortunately, IMO).
@APokorny This was rejected (again!) because implementers do not want to encourage this kind of compile-time string
There’s no other kind of compile-time string for now. It’s just that representing them as parameter packs is not efficient, and they do not want to encourage that (which is understandable but unfortunate since we have several use cases).