Re: [heycam/webidl] Should probably spec a hasInstance for DOM interface objects (#129)

FWIW, in the case I just heard, there was a need to see if an object was an instance of the `Window` interface cross-realm. So, if there's to be some sort of `Window.isInstance(crossOriginIframe.contentWindow)` then it must still return `true` for my use case (even if @@toStringTag from cross-origin makes it seem otherwise).

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