package and depencies

vendor/symfony/http-kernel/DataCollector/DataCollector.php

@@ -33,27 +33,20 @@ abstract class DataCollector implements DataCollectorInterface
      */
     protected $data = [];
 
-    /**
-     * @var ClonerInterface
-     */
-    private $cloner;
+    private ClonerInterface $cloner;
 
     /**
      * Converts the variable into a serializable Data instance.
      *
      * This array can be displayed in the template using
      * the VarDumper component.
-     *
-     * @param mixed $var
-     *
-     * @return Data
      */
-    protected function cloneVar($var)
+    protected function cloneVar(mixed $var): Data
     {
         if ($var instanceof Data) {
             return $var;
         }
-        if (null === $this->cloner) {
+        if (!isset($this->cloner)) {
             $this->cloner = new VarCloner();
             $this->cloner->setMaxItems(-1);
             $this->cloner->addCasters($this->getCasters());
@@ -84,10 +77,7 @@ abstract class DataCollector implements DataCollectorInterface
         return $casters;
     }
 
-    /**
-     * @return array
-     */
-    public function __sleep()
+    public function __sleep(): array
     {
         return ['data'];
     }
@@ -106,7 +96,7 @@ abstract class DataCollector implements DataCollectorInterface
     /**
      * @internal to prevent implementing \Serializable
      */
-    final protected function unserialize($data)
+    final protected function unserialize(string $data)
     {
     }
 }