Re: [heycam/webidl] void -> undefined, and allow it anywhere. (#906)

Same deal there - we literally can't restrict `undefined` in those ways if we want to allow it in unions *at all*, because it'll suddenly make webidl require infinite lookahead, rather than the finite (single-token, in fact) lookahead it currently uses.

We'd need to introduce a whole new syntax construct that immediately distinguishes "unions that allow undefined" from "unions without undefined".

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