Re: [whatwg/webidl] Normative: Add DOMException cause (PR #1179)

I was in favor of the accessor for consistency with `message` (and `stack` in SpiderMonkey) + the unusualness of Web IDL constructs defining own data properties, but @ljharb’s explanation changed my mind. More reliable API contracts for _“whatever value was just thrown at me”_ is worth a lot more. DOMException is already a lil freaky anyway.

Also tho I sincerely hope nobody ends up needing to spot the distinction between `"cause" in new Error("", { cause: undefined })`  and `"cause" in new Error`, if they did need to and couldn’t, that’d be worse. Given `cause` would typically be a value the cause-bearing-error thrower is just passing along from possibly unrelated code, this might be your only signal that something more spooky’s going down.


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