In Bug 141816 Comment #17, Alexey suggests switching debug asserts to release asserts to catch issues sooner with a better error message.
Created attachment 247924 [details]
Comment on attachment 247924 [details]
Clearing flags on attachment: 247924
Committed r181067: <http://trac.webkit.org/changeset/181067>
All reviewed patches have been landed. Closing bug.