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

The specification still seems to use “forwards that name to the internal set object” as described at the start of the issue. Chrome/Edge/Firefox at least all appear to behave like “option 3”. Is it accurate to say that it’s the spec text which is mistaken here and that implementations should follow the behavior agents are already implementing?

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> But if the [[BackingSet]] is created in the same Realm as the object itself [...]

Is the “if” in this sentence just like “if [thing we know], then [we can infer],” or is realm actually unspecified?

Given “internally create a new object implementing the interface” doesn’t account for initializing [[BackingSet]] — which I guess is part of what that _“Define those properties imperatively instead”_ note is about — I searched a bit instead for text that might “ambiently” establish how a phrase like “newly created Set object” should be interpreted, but I couldn’t find anything.

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