Stub ItemList::getIterator return type (#869)

Stub ItemList::getIterator return type

Author: Niklan

stubs/Drupal/Core/TypedData/Plugin/DataType/ItemList.stub

@@ -13,4 +13,10 @@ use Drupal\Core\TypedData\TypedDataInterface;
  * @implements ListInterface<T>
  */
 class ItemList extends TypedData implements \IteratorAggregate, ListInterface {
+
+  /**
+   * @return \ArrayIterator<int, T>
+   */
+  public function getIterator(): \ArrayIterator {}
+
 }