Added readonly

All classes can be readonly.

Author: Six

src/AbstractStrategy.php

@@ -13,16 +13,16 @@
  * @template T
  * @implements IteratorAggregate<int, list<T>>
  */
-abstract class AbstractStrategy implements Countable, IteratorAggregate
+abstract readonly class AbstractStrategy implements Countable, IteratorAggregate
 {
     /** @var list<T> */
-    protected readonly array $elements;
+    protected array $elements;
 
     /** @var int<0, max> */
-    protected readonly int $n;
+    protected int $n;
 
     /** @var int<1, max> */
-    protected readonly int $k;
+    protected int $k;
 
     /**
      * @param array<array-key, T> $elements

src/Combination/WithRepetition.php

@@ -11,7 +11,7 @@
  * @template T
  * @extends AbstractStrategy<T>
  */
-final class WithRepetition extends AbstractStrategy
+final readonly class WithRepetition extends AbstractStrategy
 {
     #[Override]
     protected function next(array $elements, int $i): array

src/Combination/WithoutRepetition.php

@@ -12,7 +12,7 @@
  * @template T
  * @extends AbstractStrategy<T>
  */
-final class WithoutRepetition extends AbstractStrategy
+final readonly class WithoutRepetition extends AbstractStrategy
 {
     #[Override]
     protected function assertValid(): void

src/Permutation/WithRepetition.php

@@ -10,7 +10,7 @@
  * @template T
  * @extends AbstractStrategy<T>
  */
-final class WithRepetition extends AbstractStrategy
+final readonly class WithRepetition extends AbstractStrategy
 {
     #[Override]
     protected function next(array $elements, int $i): array

src/Permutation/WithoutRepetition.php

@@ -11,7 +11,7 @@
  * @template T
  * @extends AbstractStrategy<T>
  */
-final class WithoutRepetition extends AbstractStrategy
+final readonly class WithoutRepetition extends AbstractStrategy
 {
     #[Override]
     protected function assertValid(): void