Firefox 15 will support `Number.isNaN`, default parameters, and rest parameters, as per ECMAScript 6. http://mzl.la/LmGKWz
@yahelc I think so. Without unneeded reassignment:
Number.isNaN || Number.isNaN = function(x) { return x !== x; };
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@yahelc I think so. Without unneeded reassignment:
Number.isNaN || Number.isNaN = function(x) { return x !== x; };