def METHOD_NAME(protocol):
    c = MaskedColumn(
        data=[1, 2],
        name="a",
        format="%05d",
        description="col a",
        unit="cm",
        meta={"a": 1},
    )
    c.mask[1] = True
    c.fill_value = -99
    cs = pickle.dumps(c)
    cp = pickle.loads(cs)
    assert np.all(cp._data == c._data)
    assert np.all(cp.mask == c.mask)
    assert cp.attrs_equal(c)
    assert cp.fill_value == -99
    assert cp._parent_table is None
    assert repr(c) == repr(cp)