[Bug 20567] Change [[Prototype]] for concept-node-adopt?

https://www.w3.org/Bugs/Public/show_bug.cgi?id=20567

--- Comment #16 from Geoffrey Garen <ggaren@apple.com> ---
> Changing identity after garbage collection is by definition not
> web-detectable, no (as long as expandos don't get lost in the process, and
> ignoring this prototype issue)?

Ah, yes. In WebKit's current behavior, only the prototype change is observable.

> I'm talking about cases in which foo.firstChild.parentNode == foo suddenly
> starts returning false, which is impossible right now but would no longer be
> impossible with your proposal.

Got it.

If I have some time, maybe I can try out the full behavior in a WebKit nightly
build.

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