Method append

test/orm/test_collection.py:72–77

(self, obj, value, initiator)

        event.listen(attr, "set", self.set)

    def append(self, obj, value, initiator):
        if self.dupe_check:
            assert value not in self.added
            self.added.add(value)
        self.data.add(value)
        return value

    def append_wo_mutation(self, obj, value, initiator):
        if self.dupe_check: