JuliaLang/julia — comment on commit 48fde4e16c84afb6a99c7aebf6af4d75a2ad443b
File:  line 0
By JeffBezanson:

Actually, good to keep mandel in there since it shows that first-class complex numbers are fast, and you don't have to play games like writing it in terms of reals or skipping the sqrt and comparing to 4 instead of 2.