 @@ -48,4 +48,4 @@ interface NormalizerInterface
       * @return bool
       */
--    public function supportsNormalization(mixed $data, string $format = null /*, array $context = [] */);
-+    public function supportsNormalization(mixed $data, string $format = null /*, array $context = [] */): bool;
+-    public function supportsNormalization(mixed $data, string $format = null /* , array $context = [] */);
++    public function supportsNormalization(mixed $data, string $format = null /* , array $context = [] */): bool;
  }
 diff --git a/src/Symfony/Component/Templating/Helper/HelperInterface.php b/src/Symfony/Component/Templating/Helper/HelperInterface.php
 index 5dade65db5..db0d0a00ea 100644

@@ -45,4 +45,4 @@ interface DecoderInterface
      * @return bool
      */
-    public function supportsDecoding(string $format /*, array $context = [] */);
+    public function supportsDecoding(string $format /*, array $context = [] */): bool;
 }
diff --git a/src/Symfony/Component/Serializer/Normalizer/AbstractNormalizer.php b/src/Symfony/Component/Serializer/Normalizer/AbstractNormalizer.php
index 44ba45f581..3398115497 100644

@@ -57,4 +57,4 @@ interface DenormalizerInterface
      * @return bool
      */
-    public function supportsDenormalization(mixed $data, string $type, string $format = null /* , array $context = [] */);
+    public function supportsDenormalization(mixed $data, string $type, string $format = null /* , array $context = [] */): bool;
 }
diff --git a/src/Symfony/Component/Serializer/Normalizer/NormalizerInterface.php b/src/Symfony/Component/Serializer/Normalizer/NormalizerInterface.php
index 741f19e50b..acf3be931b 100644
