add a new AttributeEvent for the generic "flag_modified" event handler

(SQLAlchemy 1.0.11)

Column definition in model:

public_data = Column(MutableDict.as_mutable(JSON), nullable=False)

Event listener in same model file:

def __listener(target, value, oldvalue, initiator):
    ... do some stuff

event.listen(User.public_data, 'set', __listener)

Change that should trigger set event:

# this doesn't work
user.public_data['address'] = ''

# but this works
user.public_data = {}

The event is never triggered when only a JSON attribute is modified. I stepped through the SQLAlchemy code and found that after the first line above is executed, the model's changed() method is called, which I assume should be responsible for the event firing. Am I doing something wrong or is this not supported?

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