Add getSupportedTypes method for (de)normalizerInterface implementations

src/Bundle/ChillMainBundle/Serializer/Normalizer/GenderDocGenNormalizer.php

@@ -37,4 +37,11 @@ class GenderDocGenNormalizer implements \Symfony\Component\Serializer\Normalizer
             'type' => 'chill_main_gender',
         ];
     }
+
+    public function getSupportedTypes(?string $format): array
+    {
+        return [
+            Gender::class => true,
+        ];
+    }
 }