Annoyance with new integer promotion deprecations

[Adam D. Ruppe]

On Wednesday, 7 February 2018 at 00:00:05 UTC, Nick Sabalausky 
(Abscissa) wrote:
> //pragma(msg, 3.14159.text); // Ugh, ok, floats don't work 
> though :(

So I saw a stb_sprintf with a from-scratch impl, including 
floats, public domain. Someone on IRC was thinking about porting 
it.

Maybe we should actually bring that in for the ctfe floats.