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

Why would 2 not be possible? The IDL layer can always throw, right? So throw something IDL would never throw, like `1`. It seems hard for that to have a side-effect since at that point the specification algorithm hasn't run.

And although 1 is non-obvious, it seems better than maintaining a "supported features" side-table, which we've known historically to not work. (Perhaps we can do better now with better tests, but hmm...)

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