DX: type-hing oneToMany and ManyToMany properties as collection

src/Bundle/ChillMainBundle/Entity/Center.php

@@ -23,14 +23,14 @@ use Symfony\Component\Serializer\Annotation as Serializer;
 class Center implements HasCenterInterface, \Stringable
 {
     /**
-     * @var Collection
+     * @var Collection<GroupCenter>
      *
      * @ORM\OneToMany(
      *     targetEntity="Chill\MainBundle\Entity\GroupCenter",
      *     mappedBy="center"
      * )
      */
-    private $groupCenters;
+    private Collection $groupCenters;
 
     /**
      * @var int