JuliaLang/julia — comment on commit 6f85a7cf5261c53899a72dd82d59db414628d49c
File:  line 0
By StefanKarpinski:

The Bool example is actually a really powerful argument for doing all arithmetic as Int64. It kind of distills the problem down to its essence. But Int8 is really not fundamentally different. Nor is Int32, of course, but the range is big enough in that case for it to be ok.