Re: [heycam/webidl] add a type to represent the undefined value (#60)

I've got another case of this, and it's also about maplikes - I want to write a custom `.get()`, but it looks like I have to set its return type to `any` so that I can properly return `undefined`.

(I first tried to use `(void or CSSStyleValue)`, but that's not allowed per the grammar.)

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