'length' property is wrong for variadic operations:
The final argument of a variadic operation is also considered to be an optional argument, so we should not account for it when computing the value of the 'length' property.
Created attachment 262271 [details]
Comment on attachment 262271 [details]
Clearing flags on attachment: 262271
Committed r190621: <http://trac.webkit.org/changeset/190621>
All reviewed patches have been landed. Closing bug.