Fix serializer stubs

Author: ossinkine

stubs/ContextAwareDenormalizerInterface.stub

@@ -6,7 +6,7 @@ interface ContextAwareDenormalizerInterface extends DenormalizerInterface
 {
     /**
      * @param mixed $data
-     * @param string $format
+     * @param string|null $format
      * @param array<mixed> $context
      * @return bool
      */

stubs/ContextAwareNormalizerInterface.stub

@@ -6,7 +6,7 @@ interface ContextAwareNormalizerInterface extends NormalizerInterface
 {
     /**
      * @param mixed $data
-     * @param string $format
+     * @param string|null $format
      * @param array<mixed> $context
      * @return bool
      */

stubs/DenormalizerInterface.stub

@@ -7,7 +7,7 @@ interface DenormalizerInterface
     /**
      * @param mixed $data
      * @param string $type
-     * @param string $format
+     * @param string|null $format
      * @param array<mixed> $context
      * @return object|array<mixed>
      */
@@ -16,7 +16,7 @@ interface DenormalizerInterface
     /**
      * @param mixed $data
      * @param string $type
-     * @param string $format
+     * @param string|null $format
      * @return bool
      */
     public function supportsDenormalization($data, $type, $format = null);

stubs/EncoderInterface.stub

@@ -8,7 +8,7 @@ interface EncoderInterface
      * @param mixed $data
      * @param string $format
      * @param array<mixed> $context
-     * @return string|int|float|bool
+     * @return string
      */
     public function encode($data, $format, array $context = []);
 

stubs/NormalizerInterface.stub

@@ -6,7 +6,7 @@ interface NormalizerInterface
 {
     /**
      * @param mixed $object
-     * @param string $format
+     * @param string|null $format
      * @param array<mixed> $context
      * @return array<mixed>|string|int|float|bool|null
      */