This is a safety measure so as to catch bad practice early on.
Created attachment 335869 [details] Patch
Comment on attachment 335869 [details] Patch Clearing flags on attachment: 335869 Committed r229639: <https://trac.webkit.org/changeset/229639>
All reviewed patches have been landed. Closing bug.
<rdar://problem/38513800>
Re-opened since this is blocked by bug 183683
Created attachment 335976 [details] Refined assertion
Comment on attachment 335976 [details] Refined assertion Clearing flags on attachment: 335976 Committed r229903: <https://trac.webkit.org/changeset/229903>