Re: [w3c/webcomponents] Clarify "report an exception" for Custom Elements (#635)

There's on complication around this, which is the exception that https://html.spec.whatwg.org/multipage/custom-elements.html#concept-upgrade-an-element step 7.2 throws.  This is happening outside the normal callback machinery, so wouldn't just automatically pick up webidl callback error reporting.  But other than that complication, is there a reason we can't use normal webidl callback error reporting for everything else?

For that SameValue check, ideally we would treat it like we would treat an exception from C itself, in terms of reporting...

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