feat: accept items in constructor arguments for in memory repository

Author: Bl00D4NGEL

src/Infrastructure/InMemory/Repository.php

@@ -17,18 +17,16 @@
  */
 abstract class Repository implements RepositoryInterface
 {
-    /**
-     * @var T[]
-     */
-    protected array $items = [];
-
     /**
      * @param class-string<T> $itemType
+     * @param T[] $items
      */
     public function __construct(
         private string $itemType,
+        protected array $items = []
     ) {
         Assert::that($this->itemType)->classExists();
+        Assert::thatAll($this->items)->isInstanceOf($this->itemType);
     }
 
     /**