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

@annevk, I think the event object would hold a strong reference, why weak? At the end of dispatch it would be replaced by an empty array. But of course none of the arrays need to be created eagerly, if the attribute is never read then no actual array would be created. It's probably easier to spec it as a internal slot, though.

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