Type system resolves 0 into string.
Imported from http://bugzilla.roxen.com/bugzilla/show_bug.cgi?id=6941
Reported by Martin Nilsson nilsson@opera.com
Type system issue:
Pike v7.9 release 11 running Hilfe v3.5 (Incremental Pike Frontend)
> typeof(max(0,0));
(1) Result: string