Re: [webcomponents] Custom elements disconnected from a document should not be upgraded (#419)

Yeah, that's the proposal.  The problem is that the current spec says that we need to treat any element with `-` as a custom element regardless of whether the author has shown the intent to use custom elements or not.  As such, any existing content that creates a lot of temporary elements that never call `defineElement` would leak all those elements indefinitely.

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