@SuppressWarnings("CloneDoesntCallSuperClone,CloneDoesntDeclareCloneNotSupportedException")
    @Override
    public ImmutablePath clone() {
        return this;
    }
@author Marko A. Rodriguez (http://markorodriguez.com)
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/util/ImmutablePath.java