| ⇢ | A | Required added | |
| A | ↛ | NotRequired removed |
| ⇢ | A | Required::isValid() added | |
| ⇢ | A | Validator::isRequired() added | |
| ⇢ | A | AbstractRule::classShortName() added | |
| A | ↛ | RuleSet::shouldValidate() removed | |
| A | ↛ | NotRequired::instance() removed | |
| A | ↛ | Validator::only() removed | |
| A | ↛ | Validator::except() removed | |
| A | ↛ | RuleSet::hasRule() removed | |
| A | ↛ | RuleSet::isAllowsEmpty() removed | |
| A | ↛ | RuleSet::isNotRequired() removed | |
| A | ↛ | NotRequired::validate() removed |