> I objected that I did not want including <cstddef> to require the
> implementation to perform header search for <optional> and
> <dynarray>
> (and whatever other headers we add in the future). I would expect
> issuing these file system requests to have a measurable cost.

OK. And you don't think it's practical for <cstddef> just to know the right answer, and unconditionally define either or both of those two macros as appropriate?

Clark