some classes marked as final (BC break)

src/Forms/ControlGroup.php

@@ -15,7 +15,7 @@
 /**
  * A user group of form controls.
  */
-class ControlGroup
+final class ControlGroup
 {
 	protected \SplObjectStorage $controls;
 	private array $options = [];

src/Forms/Helpers.php

@@ -18,7 +18,7 @@
 /**
  * Forms helpers.
  */
-class Helpers
+final class Helpers
 {
 	use Nette\StaticClass;
 

src/Forms/Rule.php

@@ -16,7 +16,7 @@
 /**
  * Single validation rule or condition represented as value object.
  */
-class Rule
+final class Rule
 {
 	public Control $control;
 	public mixed $validator;

src/Forms/Rules.php

@@ -17,7 +17,7 @@
  * List of validation & condition rules.
  * @implements \IteratorAggregate<int, Rule>
  */
-class Rules implements \IteratorAggregate
+final class Rules implements \IteratorAggregate
 {
 	private const NegRules = [
 		Form::Filled => Form::Blank,

src/Forms/Validator.php

@@ -17,7 +17,7 @@
 /**
  * Common validators.
  */
-class Validator
+final class Validator
 {
 	use Nette\StaticClass;