Thanks, so from "Only those features that have a history and are in common use by a commercial implementation should be considered", this precludes stuff that may only exist in
clang, gcc, glibc, etc.? If so, why?
Basically, we prefer seeing features that real users have used as opposed to an experimental branch of a compiler that doesn't have usage experience. Knowing it can be implemented is one thing, but knowing users want to use it is more compelling.