BYK/ES5 — comment on commit 0429330204fa1e51f9902237254b1bd2e34ce159
File: test/unit/Array.js line 80
By BYK:

May be we should consider using ".join(',')" for a more explicit concatenation. Also I think we should explicitly check if the returned array is *not* the same array as the array the method called on since this is important.