Re: [heycam/webidl] Are operations on the `[[BackingMap]]` and `[[BackingSet]]` page-hookable? And if not, why not? (#254)

OK.  Note, also, that either Maps know about their iterators and update them on mutation or you have to leak memory on mutation (by implementing the spec's algorithm word for word), or you leak memory while any iterator is live (which means you also have to know about your iterators).  Sharing the actual Map implementation of the "let's not leak" option may not be very easy from outside the ES implementation in browsers...

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