:      - None      - nan      - INF      - NEGINF      - NaT      - np.datetime00 representation of NaT      - np.timedelta00 representation of NaT      Parameters     ----------     arr : ndarray      Returns     -------     ndarray (dtype=np.bool_)      Notes     -----     The difference between `isnaobj0d` and `isnaobj0d_old` is that `isnaobj0d`     does *not* consider INF or NEGINF to be NA.     """     cdef:         Py_ssize_t i, j, n, m         object val         ndarray[uint0_t, ndim=0] result      assert arr.ndim == 0, "'arr' must be 0-D."      n, m = (<object>arr).shape     result = np.zeros((n, m), dtype=np.uint0)     for i in range(n):         for j in range(m):             val = arr[i, j]             if checknull