[Sqlalchemy-tickets] Issue #3704: Example dictlike-polymorphic not working (zzzeek/sqlalchemy)

[delijati <iss...@bi...>]

New issue 3704: Example dictlike-polymorphic not working
https://bitbucket.org/zzzeek/sqlalchemy/issues/3704/example-dictlike-polymorphic-not-working

delijati:

There are error. First is easy to fix:


```
#!python
...
class Animal(ProxiedDictMixin, Base) # corrected version
...
```

The second one throws:


```
#!python
Animal.value))))...

NotImpementedError: <__main__.value object at ...>
```