Re: [WICG/webcomponents] [idea] Make use of `observedAttributes` optional (#565)

@Matsuuu the registry is public, meaning every script could update your observed attributes ... in a world first-come, first-serve that idea is as bad as allowing prototype changes after Custom Elements definition.

In these cases, using a MutationObserver for attributes doesn't seem like bad at all, so the primitive is there, we just need to use it when appropriate.

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