error comparing assocation proxy of attribute mapped collection

I discovered this while writing tests for a model which implements a dictionary-style access to a column of a related class. I can reproduce this on SQLAlchemy 0.6.6 and 0.6.7 (have not tried 0.7 yet) using the attached script. The resulting traceback is:

Traceback (most recent call last):
  File "bin/py", line 98, in <module>
    execfile(__file__)
  File "/tmp/x.py", line 54, in <module>
    assert art.attributes=={'foo': 'bar'}
  File "/Users/wichert/Library/eggs/SQLAlchemy-0.6.7-py2.7.egg/sqlalchemy/ext/associationproxy.py", line 179, in __get__
    proxy = self._new(_lazy_collection(obj, self.target_collection))
  File "/Users/wichert/Library/eggs/SQLAlchemy-0.6.7-py2.7.egg/sqlalchemy/ext/associationproxy.py", line 227, in _new
    self.collection_class = util.duck_type_collection(lazy_collection())
  File "/Users/wichert/Library/eggs/SQLAlchemy-0.6.7-py2.7.egg/sqlalchemy/ext/associationproxy.py", line 307, in __call__
    return getattr(obj, self.target)
  File "/Users/wichert/Library/eggs/SQLAlchemy-0.6.7-py2.7.egg/sqlalchemy/orm/attributes.py", line 168, in __get__
    instance_dict(instance))
  File "/Users/wichert/Library/eggs/SQLAlchemy-0.6.7-py2.7.egg/sqlalchemy/orm/attributes.py", line 392, in get
    return self.set_committed_value(state, dict_, value)
  File "/Users/wichert/Library/eggs/SQLAlchemy-0.6.7-py2.7.egg/sqlalchemy/orm/attributes.py", line 810, in set_committed_value
    collection.append_without_event(item)
  File "/Users/wichert/Library/eggs/SQLAlchemy-0.6.7-py2.7.egg/sqlalchemy/orm/collections.py", line 560, in append_without_event
    getattr(self._data(), '_sa_appender')(item, _sa_initiator=False)
  File "/Users/wichert/Library/eggs/SQLAlchemy-0.6.7-py2.7.egg/sqlalchemy/orm/collections.py", line 1418, in set
    key = self.keyfunc(value)
TypeError: attribute name must be a string

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