@Override
    public int hashCode() {
        return carriesUnmergeableSack() ? System.identityHashCode(this) : (super.hashCode() ^ this.loops ^ Objects.hashCode(this.loopName));
    }
@author Marko A. Rodriguez (http://markorodriguez.com)
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/traverser/O_OB_S_SE_SL_Traverser.java