[Bug 20019] Support subclassing ES6 Map

https://www.w3.org/Bugs/Public/show_bug.cgi?id=20019

--- Comment #2 from Tab Atkins Jr. <jackalmage@gmail.com> ---
Also, while we're doing this, we should check to see if there are any use-cases
in the DOM for ES Sets, and add that at the same time.

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Received on Tuesday, 20 November 2012 18:23:58 UTC