Firefox 15 will support `Number.isNaN`, default parameters, and rest parameters, as per ECMAScript 6. http://mzl.la/LmGKWz
@alexdickson No. They’re a bit different, too. Global `isNaN` coerces its argument to a Number first, but `Number.isNaN` doesn’t.
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@mathias Right, makes sense :)Thanks. Twitter will use this to make your timeline better. UndoUndo
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