> I was surprised seeing that array copying is done as 
> "b = merge( a, [] )" in place of "b = a.concat();": 
> shouldn't the latter be faster?

The problem with .concat() is that "a" is not always an array. It is often a
NodeList returned from getElementsByTagName() or childNodes. You might think
that Array.concat.apply(a) would work but not in IE.


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