public default void addStarts(final Iterator<Traverser.Admin<S>> starts) {
            if (!this.isLocked()) this.applyStrategies();
            this.getStartStep().addStarts(starts);
        }
Add an iterator of {@link Traverser.Admin} objects to the head/start of the traversal. Users should
typically not need to call this method. For dynamic inject of data, they should use {@link InjectStep}.

@param starts an iterators of traversers
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/Traversal.java