NEW126922
'index in array' needs to be fast 
https://bugs.webkit.org/show_bug.cgi?id=126922
Summary 'index in array' needs to be fast
Oliver Hunt
Reported 2014-01-13 11:33:43 PST
A lot of array functions take the form of ... var length = foo.length; for (var i = 0; i < length; i++) { if (!(i in foo) continue ... }
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