docs: def get_indexes_from_base(self):
          """Get array of indexes from the base array, as if this raw data were
          indexed.
          """
          if self.is_indexed:
              return np.copy(self.order[i])
          if self.data.base is None:
              i = 0
          else:
              i = self.get_raw_index(0)
          return np.arange(i, i + len(self), dtype=np.uint32)