| A | ↛ | DummyDriver removed |
| F | ↗ | C | Driver.read() improved |
| A | ↛ | DummyDriver.__init__() removed | |
| A | ↛ | DummyDriver._read() removed | |
| A | ↛ | DummyDriver._isOpen() removed | |
| A | ↛ | DummyDriver._write() removed | |
| A | ↛ | Driver.splitN() removed | |
| A | ↛ | DummyDriver._close() removed | |
| A | ↛ | DummyDriver._open() removed |