Re: [whatwg/dom] Should attachShadow throw or override when an existing declarative shadow root doesn't match? (Issue #1235)

I did think about this one. The important detail (to me at least) is that `attachShadow` in these cases will clear out the shadow root before returning it. So it's not like this is an end-run around revealing closed shadow root content or anything. It's just a weird way to create a closed shadow root via a call to `attachShadow({mode:'open'})`.

I do agree that it's perhaps a bit odd that the options provided to `attachShadow` don't get respected in this case, but the alternative seemed worse to me: *changing* the flags on an already-existing shadow root as a result of this call. I'm open to suggestions. (Keeping in mind that several implementations have shipped.)

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