Re: [webcomponents] Change deepPath() back to path (a FrozenArray<EventTarget> attribute) (#428)

Yes, but that shouldn't be an additional problem, as long as it has to change *once* (which it must) then the model is already one where the attribute's value can change. However, it would still be possible to make `event.path===event.path` always evaluate to true. Implementation-wise, the bindings would have to ask the internal `Event` class if `path` has changed since it was last returned, and if not just return the previous value. It would be very similar to [a proposed change to `HTMLMediaElement`'s `buffered` attribute](https://www.w3.org/Bugs/Public/show_bug.cgi?id=22471).

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