Typechecking is a problem.
typeof is limited and allows host objects to return anything. The
problem is that some host objects return "function", for example, a
NodeList in Safari. This is perfectly legal, according to the spec.
Checking instanceof between frames doesn't work.
var i = document.getElementsByTagName("iframe")[0].contentWindow;
i.someFunction instanceof Function; // false.
How is type checking addressed in ES4?
Garrett
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Programming is a collaborative art.
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