codemix/fast.js — pull request #55 by FredyC (2014-09-07 08:58:03+00:00)
Title: support for starting index of cloneArray

It is just minor extension. It has definitely usage in slicing `arguments`. I didn't bothered with end index because that is used sparsely in my opinion.

I hope it's not a big slowdown, I am unable to run benchmark because of Windows.