Re: [heycam/webidl] A new approach to array-ish classes (#796)

> Note that the above designs will still fail `Array.isArray()`. There's no way to pass that check without getting changes to the 262 spec.

For completeness, I think this could be hacked around by making `ReadonlyArray` and `ObservableArray`s exotic proxy objects around inner `Array`s, since `Array.isArray(new Proxy([], {}))` is true (for some reason). However, I have a very hard time seeing this play well with Web IDL binding infrastructure in implementations.

I guess we could define them as exotic proxy objects in the spec and have implementations do some kind of behind-the-scenes hack, but, meh.

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