Re: [w3c/webcomponents] [feature request] change when upgrade/connected happens during parsing, so that it is the first event in the following microtask (#787)

> How would you solve that problem?

I see a way: check if `this.getRootNode()` is a `#document`. If not, then don't act on MutationObserver changes, so we act on them only while connected in a document.

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