Re: [heycam/webidl] iterable's should have more than just forEach() (#561)

> IMO if you want an array, you should not be using iterable<>. You should be using an array. iterable<> is when you need to create some completely custom collection, e.g. DOMTokenList (a type of set), URLSearchParams (a multi-map), or when you need to adapt legacy array-likes.

Or when you want something that looks like an Array but actually implements the same sort of typechecking that every single other object in WebIDL is allowed to implement...

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