--- a/src/Symfony/Component/HttpKernel/DataCollector/DataCollector.php+++ b/src/Symfony/Component/HttpKernel/DataCollector/DataCollector.php@@ -70,16 +70,21 @@ abstract class DataCollector implements DataCollectorInterface         $casters = [             '*' => function ($v, array $a, Stub $s, $isNested) {                 if (!$v instanceof Stub) {+                    $b = $a;                     foreach ($a as $k => $v) {                         if (!\is_object($v) || $v instanceof \DateTimeInterface || $v instanceof Stub) {                             continue;                         }                          try {-                            $a[$k] = new CutStub($v);+                            $a[$k] = $s = new CutStub($v);++                            if ($b[$k] === $s) {+                                // we've hit a non-typed reference+                                $a[$k] = $v;+                            }                         } catch (\TypeError $e) {-                            $a[$k] = &$v;-                            unset($v);+                            // we've hit a typed reference                         }                     }                 }