Re: [heycam/webidl] Introduce the observable array type (#836)

> (which I think is the only material difference here; all the Array functions would work via index access and length).

The big material difference here is that, unlike indexed getters and setters, here web developers can mutate the array contents. As I said above,

> The spec-author-provided getter, in particular, can't be sure what to get, if there have been author mutations in the meantime. Or, well, it can, but doing so would require adding spec text to the setter to track all such mutations. This approach attempts to move all that bookkeeping into the Web IDL spec, so that the spec author can instead use the always-updated "backing observable array contents" list, plus the hooks to react to changes to that list.

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