Re: [webcomponents] defineElement should not cache lifecycle callbacks and prototype of a custom element class (#417)

In https://www.w3.org/2016/01/25-webapps-minutes.html, search for "on a different topic, why do we keep the callback" the motivation seems to be speed. That you don't want the set of callbacks to change over time. It's still all a little weird though. (I don't think `[[Get]]` being observable is the problem here, since invoking the callback is already observable. And that would happen right after.)

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