public boolean hasNext() {
                return this.lastCount > 0l || this.entryIterator.hasNext();
            }
@return true if it is guaranteed that all contained elements/objects are of the same type/class and not null (but not
necessarily, i.e., they can have the same type/class, but we may return false here if it was not analysed/identified)
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/util/BulkSet.java