| ⇢ | A | Never added | |
| ⇢ | A | WhenEmpty added | |
| ⇢ | A | WhenNull added | |
| A | ↛ | NullEmpty removed | |
| A | ↛ | NoEmpty removed | |
| A | ↛ | SimpleEmpty removed |
| ⇢ | A | WhenEmpty::__invoke() added | |
| ⇢ | A | Never::__invoke() added | |
| ⇢ | A | Required::getEmptyCriteria() added | |
| ⇢ | A | WhenEmpty::__construct() added | |
| ⇢ | A | WhenNull::__invoke() added | |
| A | ↛ | SimpleEmpty::__invoke() removed | |
| A | ↛ | Required::getEmptyHandler() removed | |
| A | ↛ | NullEmpty::__invoke() removed | |
| A | ↛ | NoEmpty::__invoke() removed | |
| A | ↛ | SimpleEmpty::__construct() removed |