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

@rniwa Yes, however you're missing a key point there: to avoid leaking memory and keeps things proper, the observer needs to be created in `connectedCallback` and reciprocally disposed in `disconnectedCallback`. If you do it in `connectedCallback`, you'll see it doesn't work.

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