Re: [heycam/webidl] Introduce the observable array type (proxy-based) (#840)

Since we are defining the object in terms of Proxy, my assumption is that redundant hooks are necessary. If we don’t define a `get` hook, then the _target_’s version of [[GetOwnProperty]] will be used instead of the `getOwnPropertyDescriptor` hook, since the spec just calls out to _target_.[[Get]] directly. This is different from overriding internal methods, where any change to internal methods will be picked up by other ones automatically.

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