[Serializer] Fix ignoring objects that only implement DenormalizableI…

…nterface

Normalizer/CustomNormalizer.php

@@ -28,6 +28,7 @@ public function getSupportedTypes(?string $format): array
     {
         return [
             NormalizableInterface::class => __CLASS__ === static::class || $this->hasCacheableSupportsMethod(),
+            DenormalizableInterface::class => __CLASS__ === static::class || $this->hasCacheableSupportsMethod(),
         ];
     }
 

Tests/SerializerTest.php

@@ -50,6 +50,7 @@
 use Symfony\Component\Serializer\Tests\Fixtures\Annotations\AbstractDummy;
 use Symfony\Component\Serializer\Tests\Fixtures\Annotations\AbstractDummyFirstChild;
 use Symfony\Component\Serializer\Tests\Fixtures\Annotations\AbstractDummySecondChild;
+use Symfony\Component\Serializer\Tests\Fixtures\DenormalizableDummy;
 use Symfony\Component\Serializer\Tests\Fixtures\DummyFirstChildQuux;
 use Symfony\Component\Serializer\Tests\Fixtures\DummyMessageInterface;
 use Symfony\Component\Serializer\Tests\Fixtures\DummyMessageNumberOne;
@@ -120,6 +121,14 @@ public function testDenormalizeNoMatch()
         $serializer->denormalize('foo', 'stdClass');
     }
 
+    public function testDenormalizeOnObjectThatOnlySupportsDenormalization()
+    {
+        $serializer = new Serializer([new CustomNormalizer()]);
+
+        $obj = $serializer->denormalize('foo', (new DenormalizableDummy())::class, 'xml');
+        $this->assertInstanceOf(DenormalizableDummy::class, $obj);
+    }
+
     public function testDenormalizeOnNormalizer()
     {
         $this->expectException(UnexpectedValueException::class);