JuliaLang/julia — comment on commit e93f8299d5036756a61cd821e8a4d829f41f4765
File:  line 0
By JeffBezanson:

This is a better interface in any case. Any time a function can take an IOStream argument, which printf does, it might as well be designed to work that way from the beginning.

All in all, a satisfying team effort to get a 15x speedup! Just think what else we could apply that to.