code: func (s *Series4h) Iter(intervalHint uint32) *Iter4h {
  	s.Lock()
  	w := s.bw.clone()
  	s.Unlock()
  
  	finishV1(w)
  	iter, _ := bstreamIterator4h(w, intervalHint)
  	return iter
  }
docs: // Iter4h lets you iterate over a series.  It is not concurrency-safe.