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

Although ObservableArrays are usable for the ReadonlyArray case, they are a bit awkward. I believe at the very least you need to specify "set the indexed value" and "delete the indexed value" as throwing exceptions. So IMO it'd be good to add a ReadonlyArray sugar which does that for you, plus any other steps which I'm missing in this morning's quick skim. (Also we could then restrict ReadonlyArrays to only work with `readonly` attributes.)

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