Re: [heycam/webidl] undefined can't be a member of a union type (#962)

I think it makes sense for `undefined` to be nullable. We don't want to perpetuate null and undefined being the same.

(It might make even more sense if `T?` became a shorthand for `T or null or undefined`. I had completely forgotten undefined satisfied `T?` (at least on the input side; the other annoyance (but also nice sometimes) with IDL is it conflating inputs and outputs).)

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