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

You just need to spec a deterministic time for when the upgrade maps are cleared. Today in blink the references are weak so you could indeed observe the GC by waiting and then doing registerElement at various times. In practice no one has ever complained or noticed.

ex. How useful is upgrade after the load event as fired? Maybe we should turn that system off at that point?

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