docs: def read_entry(self):
      """get the next value from the array, and set internal iterator so next call will be next entry
  
      :return: The next GenomicRange entry
      :rtype: GenomicRange
      """
      if len(self.bedarray) <= self.curr_ind: return None
      val = self.bedarray[self.curr_ind]
      self.curr_ind += 1
      return val