Merge pull request #32 from FranMoraton/feature/add-iterator-and-coun…

…table-type-to-collections

add iterator and countable type hint to collection

src/Domain/Model/ValueObject/CollectionValueObject.php

@@ -17,7 +17,7 @@ public static function from(array $items): static
         return new static($items);
     }
 
-    public function current()
+    public function current(): mixed
     {
         return \current($this->items);
     }
@@ -27,7 +27,7 @@ public function next(): void
         \next($this->items);
     }
 
-    public function key()
+    public function key(): string|int|null
     {
         return \key($this->items);
     }