fix unexpected type in denormalization errors when union type used in constructor in xml

Author: d-mitrofanov-v

Normalizer/AbstractObjectNormalizer.php

@@ -601,6 +601,8 @@ private function validateAndDenormalize(array $types, string $currentClass, stri
                 if (!$isUnionType && !$isNullable) {
                     throw $e;
                 }
+
+                $expectedTypes[Type::BUILTIN_TYPE_OBJECT === $builtinType && $class ? $class : $builtinType] = true;
             } catch (ExtraAttributesException $e) {
                 if (!$isUnionType && !$isNullable) {
                     throw $e;

Tests/Normalizer/ObjectNormalizerTest.php

@@ -21,6 +21,7 @@
 use Symfony\Component\PropertyInfo\PropertyInfoExtractor;
 use Symfony\Component\Serializer\Attribute\Ignore;
 use Symfony\Component\Serializer\Exception\LogicException;
+use Symfony\Component\Serializer\Exception\NotNormalizableValueException;
 use Symfony\Component\Serializer\Exception\RuntimeException;
 use Symfony\Component\Serializer\Exception\UnexpectedValueException;
 use Symfony\Component\Serializer\Mapping\ClassDiscriminatorFromClassMetadata;
@@ -41,6 +42,7 @@
 use Symfony\Component\Serializer\Tests\Fixtures\Attributes\GroupDummy;
 use Symfony\Component\Serializer\Tests\Fixtures\CircularReferenceDummy;
 use Symfony\Component\Serializer\Tests\Fixtures\DummyPrivatePropertyWithoutGetter;
+use Symfony\Component\Serializer\Tests\Fixtures\DummyWithUnion;
 use Symfony\Component\Serializer\Tests\Fixtures\FormatAndContextAwareNormalizer;
 use Symfony\Component\Serializer\Tests\Fixtures\OtherSerializedNameDummy;
 use Symfony\Component\Serializer\Tests\Fixtures\Php74Dummy;
@@ -343,6 +345,22 @@ public function testConstructorWithUnknownObjectTypeHintDenormalize()
         $normalizer->denormalize($data, DummyWithConstructorInexistingObject::class);
     }
 
+    public function testConstructorWithNotMatchingUnionTypes()
+    {
+        $data = [
+            'value' => 'string',
+            'value2' => 'string',
+        ];
+        $normalizer = new ObjectNormalizer(new ClassMetadataFactory(new AttributeLoader()), null, null, new PropertyInfoExtractor([], [new ReflectionExtractor()]));
+
+        $this->expectException(NotNormalizableValueException::class);
+        $this->expectExceptionMessage('The type of the "value" attribute for class "Symfony\Component\Serializer\Tests\Fixtures\DummyWithUnion" must be one of "int", "float" ("string" given).');
+
+        $normalizer->denormalize($data, DummyWithUnion::class, 'xml', [
+            AbstractNormalizer::ALLOW_EXTRA_ATTRIBUTES => false,
+        ]);
+    }
+
     // attributes
 
     protected function getNormalizerForAttributes(): ObjectNormalizer