Re: [heycam/webidl] Need pattern for feature detecting dictionary members (#107)

I'm a little scared of this idea since dictionaries right now are not "reified" in any way. Their names are for spec purposes only, and can be changed at will. They just represent normal JavaScript objects that authors pass in. Having there be a property on the global for each dictionary, which is going to be some type of... object? array? of supported property keys (if object, what is their value?) is pretty weird.

I don't really have any other great solution though. Something like `window.dictionarySupports("EventListenerOptions", "passive")` isn't great either.

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