(self, index: Union[int, slice])
| 136 | return attributes.History(list(added), list(unchanged), list(deleted)) |
| 137 | |
| 138 | def indexed(self, index: Union[int, slice]) -> Union[List[_T], _T]: |
| 139 | return list(self.added_items)[index] |
| 140 | |
| 141 | def add_added(self, value: _T) -> None: |
| 142 | self.added_items.add(value) |