self.postMessage(Symbol(), "*") should throw, not end up cloning null.
Created attachment 332870 [details] Patch
Comment on attachment 332870 [details] Patch Clearing flags on attachment: 332870 Committed r227969: <https://trac.webkit.org/changeset/227969>
All reviewed patches have been landed. Closing bug.
<rdar://problem/37118839>