```python
class Foo:
    pass

class Works(str, Foo, Enum):
    BAR = 'baz'

class Fails(Foo, str, Enum):
    BAR = 'baz'

```

`Fails` fails to be created with an error:

`TypeError: object.__new__(Fails) is not safe, use Fails.__new__()`

See https://github.com/python/cpython/blob/e57f91a0f0d5700ec466c9dd0fd2d2b5323a5e76/Lib/enum.py#L205