> Other than toString I believe that the only directly > user observable use of [[Class]] is the new Array.isArray > function. The main use case for this was Doug's JSON > libraries that needed to determine which objects should be > output using array literal notation. We now have enough > reflection support that he could write any sort of Array > litmus test that he thought was appropriate (for example, > length property value == largest numeric property name + 1). > Given that, maybe we don't really need Array.isArrary which > would probably simply the what does [[Class]]=="Array" mean > discussion.
There are lots of other uses for an isArray test. Since we can't fix typeof, Array.isArray is necessary.
The question is how does isArray work, does it look for [[Class]]=="Array" or does it do something more mysterious. If we can settle on what [[Class]] does, then that would seem better.
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