Re: [webcomponents] Composition Algorithm shouldn't unwrap slots (#308)

Thanks for the feedback.

I'd like to treat a slot, as well as an insertion point, as `DocumentFragment`, as ShadowRoot is. That has been in my mental model for a long time. By considering both as `DocumentFragment`, everything became clear to me.

I guess someone doesn't like a slot element being left in the document composed tree, as shadow roots is not left in the document composed tree.
A slot, a insertion point, should not be on any more than needed to support the distribution.


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