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.

I'm not sure this helps without a way to tell who is referencing the elements at this time, which seems equivalent to triggering a precise full GC at these times.

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

That seems like it would break lazy-loading of sections of pages along with their element definitions.


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