'Serializes the object derived from the base object into
a dictionary of values. This only serializes the field
attributes for the object, so this may need to be overridden
for any classes which wish to add additional items not stored
as field attributes.'

def serialize(self):

    repr = self.dump_attrs()
    repr['uuid'] = self._uuid
    repr['finalized'] = self._finalized
    repr['squashed'] = self._squashed
    return repr
