| ⇢ | A | AllowNull added | |
| ⇢ | A | AllowEmpty added | |
| A | ↛ | AllowsNull removed | |
| A | ↛ | AllowsEmpty removed |
| ⇢ | A | RuleSet::containsRequiredRule() added | |
| ⇢ | A | RuleSet::containsAllowEmptyRule() added | |
| ⇢ | A | RuleSet::containsAllowNullRule() added | |
| ⇢ | A | AllowNull::validate() added | |
| ⇢ | A | AllowEmpty::validate() added | |
| A | ↛ | AllowsNull::validate() removed | |
| A | ↛ | RuleSet::hasRequired() removed | |
| A | ↛ | RuleSet::hasAllowsNull() removed | |
| A | ↛ | RuleSet::hasAllowsEmpty() removed | |
| A | ↛ | AllowsEmpty::validate() removed |