code: def to_regular_array(self, A):
          
          # this could be a static method, but we choose to be consistent with
          # from_regular_array
          return A.view((int, len(A.dtype.names))).reshape(A.shape + (-1,))
docs: Converts from an array of type `self.dtype` to an array
          of type `int` with an additional index labeling the
          tuple indeces.
  
          :param np.ndarray A: An `np.array` of type `self.dtype`.
  
          :rtype: `np.ndarray`