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

Yeah, planning to let an explicit `undefined` in a union win out over both nullable and dictionary conversions, so it would be meaningful to have `(undefined or Foo?)` and `(undefined or MyDict)`; passing a JS `undefined` would yield the IDL undefined in both cases, rather than a null'd Foo or defaulted MyDict.

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