@Override
    public <R> Admin<R> split(final R r, final Step<T, R> step) {
        final O_Traverser<R> clone = (O_Traverser<R>) super.split(r, step);
        if (null != this.tags)
            clone.tags = new HashSet<>(this.tags);
        return clone;
    }
@author Marko A. Rodriguez (http://markorodriguez.com)
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/traverser/O_Traverser.java