docs: def serialize_ndarray_readable(o):
      """
      Serializes a :obj:`numpy.ndarray` in a human-readable format.
  
      Args:
          o (:obj:`numpy.ndarray`): :obj:`ndarray` to be serialized.
  
      Returns:
          A dictionary that can be passed to :obj:`json.dumps`.
      """
      return dict(
          _type='np.ndarray',
          dtype=o.dtype,
          value=hint_tuples(o.tolist()))