Re: [w3c/webcomponents] JavaScript bundlers, HMR and customElements.define() (#829)

I think you can reasonably fake it using `Proxy` to override `new` and define your own callbacks for each type but there is no way to update the list of observed attributes, which seems like a serious oversight.

We should probably provide a way to update the list of observed attributes for a given custom element.

@annevk @domenic 

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