docs: def _bulk_size_generator(num_records, bulk_size, active):
      """ Generate bulk_size until num_records is reached or active becomes false
  
      >>> gen = _bulk_size_generator(155, 50, [True])
      >>> list(gen)
      [50, 50, 50, 5]
      """
      while active and num_records > 0:
          req_size = min(num_records, bulk_size)
          num_records -= req_size
          yield req_size