@Override
    public int hashCode() {
        return super.hashCode() ^ this.elementClass.hashCode();
    }
@author Marko A. Rodriguez (http://markorodriguez.com)
tinkergraph-gremlin/src/main/java/org/apache/tinkerpop/gremlin/tinkergraph/process/traversal/step/map/TinkerCountGlobalStep.java