is_int64_dtype(np.array(['a', 'b']))  # doctest: +SKIP
    False
    >>> is_int64_dtype(np.array([1, 2], dtype=np.int64))  # doctest: +SKIP
    True
    >>> is_int64_dtype(pd.Index([1, 2.]))  # float  # doctest: +SKIP
    False
    >>> is_int64_dtype(np.array([1, 2], dtype=np.uint32))  # unsigned  # doctest: +SKIP
    False
    zdis_int64_dtype is deprecated and will be removed in a future version. Use dtype == np.int64 instead.rP