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

@justinfagnani 

> I think they might solve this by patching `setAttribute` and reading all attributes at connected, which obviously has some problems.

[I'm about to do this in three-elements, too](https://github.com/hmans/three-elements/pull/34), and it feels like a pretty solid solution, especially since, eventually, I can make this smart enough to make `observedAttributes` co-exist with a separate at-runtime mechanism that can make decisions on whether the attribute exists or not.

What were the obvious problems you were referring to here?

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