Re: [heycam/webidl] Remove [LegacyArrayClass] (#291)

> And to be clear, the question is what value iterators should act like when you can have repeated values and hence can't be `setlike<>`...

Right, what I'm saying is that `iterator<>` *definitely doesn't* represent anything set-like, because `setlike<>` already does that (and you can't use them together).  It's definitely for representing array-like iterables.  Thus, there's no question of whether it should act "like a set" when iterated (for the question of what the "index" argument is for `forEach`).

Whether it should have "safe" mutation during iteration is indeed a separate question, one that *happens* to map to "is like an Array" or "is like a Map/Set", but I think there's an obvious answer there too - an `iterator<>` is a light `arraylike<>` (or subclassed Array, whatever), and so for forward-compat with possible future expansion into a full array-like, it should act like Array iterators do today.

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