Re: [w3c/webcomponents] [idea] Make use of `observedAttributes` optional (#565)

Yeah, calling out to JS at all is extremely expensive. The fact we have to remember the old attribute value and queue things up when multiple attributes are modified, etc... all add up to something like 3x overhead the last time I measured.

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Received on Monday, 4 December 2017 22:13:45 UTC