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

Blink's implementation for setlike/maplike is not great so far, and it's simply broken in many ways.  We are also aware that NodeList.prototype.forEach is not Array.prototype.forEach, etc.  It's just because that we first aimed to support iterators of simple use cases without supporting details.  There is no special reason.  Don't mind too much on this.

Option 3 sounds reasonable to me, too.

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