@Override
    public StartStep<S> clone() {
        final StartStep<S> clone = (StartStep<S>) super.clone();
        clone.first = true;
        clone.start = null; // TODO: is this good?
        return clone;
    }
@author Marko A. Rodriguez (http://markorodriguez.com)
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/sideEffect/StartStep.java