Re: [whatwg/webidl] add [[ErrorData]] slot to DOMExceptions (PR #1421)

> How would you suggest I modify step 4?

By adding [[ErrorData]] to the argument list of MakeBasicObject, if the inclusive inherited interfaces of _interface_ includes DOMException.

> but by making them proper Errors, then serialization of DOMExceptions should be automatic now?

No, it's not automatic, and it should not be.

The relevant step is step 17 of https://html.spec.whatwg.org/#structuredserializeinternal. Thankfully, it's guarded by "and value is not a [platform object](https://webidl.spec.whatwg.org/#dfn-platform-object)", which means DOMException will properly go down to step 19 instead.

If we took the generic step 17 path for DOMException, we would lose the name information, and would look at the public message property instead of the internal [message](https://webidl.spec.whatwg.org/#domexception-message).

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