Re: [webcomponents] [Shadow]: Need mechanism to tell if an element in a ShadowRoot has been inserted into the Document (bugzilla: 22141) (#81)

If the only use case of `Node.contains(node, {includeShadow/deep/orAnythingElse: true})` is to answer the original question, "element is inserted into a document, deeply", how about adding more `node.inDocumentDeeply`, or something else, instead of updating `contains` method?


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