Re: [heycam/webidl] "Restricted" Float32Array (#126)

I don't quite understand the intent here, actually, and would like to understand better.

Are we copying the input Float32Array or using it by reference?  If we're copying, then it seems like you could just use a `sequence<float>` (albeit at some performance cost, in case it matters).  If you're using it by reference, non-finite things can be placed in it after you return, right?

So are we just talking about situations in which the value is used by copy (or not used after the call returns) but the overhead of the ES iteration protocol is too high for the use case, right?

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