Re: [heycam/webidl] Getting rid of optional (#905)

I  guess one aspect that is a little weird here is that `= undefined` would also end up changing the type (similar to optional). As in, if `T` is a type that is not undefined, `T x = undefined` means that `x` can be undefined or `T`, which you would normally have to write as `(T or undefined) x = undefined`. That might be reasonable, but it's something to keep in mind.

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