Re: [ServiceWorker] ExtendableMessageEvent.source cannot be SameObject (#816)

> The [SameObject] extended attribute must not be used on anything other than a read only attribute whose type is an interface type or object. (WebIDL 4.3.15 [SameObject])

Did you reference this part? Before removing it, I just want to make sure whether it intends to disallow the case when all the member types of the union are interface types.

/cc @heycam @bzbarsky

---
Reply to this email directly or view it on GitHub:
https://github.com/slightlyoff/ServiceWorker/issues/816#issuecomment-171921140