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[Bug 20131] [MutationObservers] Unclear whether unique record instances are required in 5.3.2 "Queuing a mutation record"

From: <bugzilla@jessica.w3.org>
Date: Wed, 28 Nov 2012 20:47:07 +0000
To: public-webapps-bugzilla@w3.org
Message-ID: <bug-20131-2532-2XavEJmYHx@http.www.w3.org/Bugs/Public/>
https://www.w3.org/Bugs/Public/show_bug.cgi?id=20131

--- Comment #5 from Olli Pettay <bugs@pettay.fi> ---
It would be odd if script library A observing mutations without
oldValue would get oldValue. That would be even error prone:
scripts might rely on the data to not be there if they are not observing it.
So, records should be per observer.

If implementations want to share the internal data, that is ofc ok, but better
to not expose that to JS.

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