Impossible to redeclare property in subclass

```python
class A:
 def _get_some(self):
 return 'some'
 some = property(_get_some)

class B(A):
 def _get_some(self):
 return 'some more'
 some = property(_get_some)
```

in javascript it will result in error
```TypeError: Cannot redefine property: some```

Maybe some javascript checks or wrappers should be implemented to allow python-style property re-declaration.
