Narrow TimestampedNormalizer::getSupportedTypes() to object types

Author: silverbackdan

src/Serializer/Normalizer/TimestampedNormalizer.php

@@ -63,9 +63,8 @@ public function denormalize($data, $type, $format = null, array $context = []):
         return $object;
     }
 
-    // TODO: is this only for objects?
     public function getSupportedTypes(?string $format): array
     {
-        return ['*' => false];
+        return ['object' => false];
     }
 }