docs: def _split_arrs(array_2d, slices):
      """
      Equivalent to numpy.split(array_2d, slices),
      but avoids fancy indexing
      """
      if len(array_2d) == 0:
          return np.empty(0, dtype=np.object)
  
      rtn = np.empty(len(slices) + 1, dtype=np.object)
      start = 0
      for i, s in enumerate(slices):
          rtn[i] = array_2d[start:s]
          start = s
      rtn[-1] = array_2d[start:]
      return rtn