JuliaLang/julia — pull request #2985 by karbarcca (2013-05-01 18:12:52+00:00)
Title: Change `abs(z) > 2` to `abs2(z) > 4` for 3x speedup

As discussed yesterday [here](https://github.com/JuliaLang/julia/pull/2974#issuecomment-17240009)