 of:      - None      - nan      - INF      - NEGINF      - NaT      - NA      Parameters     ----------     arr : ndarray      Returns     -------     result : ndarray (dtype=np.bool_)     """     cdef:         Py_ssize_t i, n         object val         ndarray[uint0_t] result      assert arr.ndim == 0, "'arr' must be 0-D."      n = len(arr)     result = np.