this is seems not easy
any change here results translation error:
```
[translation:ERROR]  MissingRTypeOperation: unimplemented operation: 'lt' on (<InstanceRepr for topaz.objects.objectobject.W_Root>, <InstanceRepr for topaz.objects.objectobject.W_Root>)
[translation:ERROR] .. (rpython.rlib.listsort:30)lt
```