bug symfony#52698 [Serializer] Fix XML scalar to object denormalization (mtarld)

This PR was merged into the 5.4 branch.

Discussion
----------

[Serializer] Fix XML scalar to object denormalization

| Q             | A
| ------------- | ---
| Branch?       | 5.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Issues        | Fix symfony#32114 symfony#34579
| License       | MIT

Another approach to symfony#34825

Commits
-------

6fe892f [Serializer] Fix XML scalar to object denormalization

Author: fabpot

src/Symfony/Component/Serializer/Normalizer/AbstractObjectNormalizer.php

@@ -369,6 +369,10 @@ public function denormalize($data, string $type, ?string $format = null, array $
             return null;
         }
 
+        if (XmlEncoder::FORMAT === $format && !\is_array($data)) {
+            $data = ['#' => $data];
+        }
+
         $allowedAttributes = $this->getAllowedAttributes($type, $context, true);
         $normalizedData = $this->prepareForDenormalization($data);
         $extraAttributes = [];

src/Symfony/Component/Serializer/Tests/Normalizer/AbstractObjectNormalizerTest.php

@@ -17,6 +17,7 @@
 use Symfony\Component\PropertyInfo\Extractor\ReflectionExtractor;
 use Symfony\Component\PropertyInfo\PropertyInfoExtractor;
 use Symfony\Component\PropertyInfo\Type;
+use Symfony\Component\Serializer\Annotation\SerializedName;
 use Symfony\Component\Serializer\Exception\ExtraAttributesException;
 use Symfony\Component\Serializer\Exception\InvalidArgumentException;
 use Symfony\Component\Serializer\Exception\LogicException;
@@ -30,6 +31,7 @@
 use Symfony\Component\Serializer\Mapping\Factory\ClassMetadataFactory;
 use Symfony\Component\Serializer\Mapping\Factory\ClassMetadataFactoryInterface;
 use Symfony\Component\Serializer\Mapping\Loader\AnnotationLoader;
+use Symfony\Component\Serializer\NameConverter\MetadataAwareNameConverter;
 use Symfony\Component\Serializer\Normalizer\AbstractNormalizer;
 use Symfony\Component\Serializer\Normalizer\AbstractObjectNormalizer;
 use Symfony\Component\Serializer\Normalizer\CustomNormalizer;
@@ -658,6 +660,34 @@ protected function createChildContext(array $parentContext, string $attribute, ?
 
         $this->assertFalse($normalizer->childContextCacheKey);
     }
+
+    public function testDenormalizeXmlScalar()
+    {
+        $normalizer = new class () extends AbstractObjectNormalizer
+        {
+            public function __construct()
+            {
+                parent::__construct(null, new MetadataAwareNameConverter(new ClassMetadataFactory(new AnnotationLoader(new AnnotationReader()))));
+            }
+
+            protected function extractAttributes(object $object, string $format = null, array $context = []): array
+            {
+                return [];
+            }
+
+            protected function getAttributeValue(object $object, string $attribute, string $format = null, array $context = [])
+            {
+                return null;
+            }
+
+            protected function setAttributeValue(object $object, string $attribute, $value, string $format = null, array $context = [])
+            {
+                $object->$attribute = $value;
+            }
+        };
+
+        $this->assertSame('scalar', $normalizer->denormalize('scalar', XmlScalarDummy::class, 'xml')->value);
+    }
 }
 
 class AbstractObjectNormalizerDummy extends AbstractObjectNormalizer
@@ -781,6 +811,12 @@ class DummyChild
     public $bar;
 }
 
+class XmlScalarDummy
+{
+    /** @SerializedName("#") */
+    public $value;
+}
+
 class SerializerCollectionDummy implements SerializerInterface, DenormalizerInterface
 {
     private $normalizers;