def METHOD_NAME():
    i8 = np.array(1, dtype=np.int64)
    f8 = np.array(1, dtype=np.float64)
    u3 = np.array("123")
    with pytest.raises(MergeConflictError):
        common_dtype([i8, u3])
    assert common_dtype([i8, i8]).endswith("i8")
    assert common_dtype([i8, f8]).endswith("f8")