diff --git a/DataCollector/SerializerDataCollector.php b/DataCollector/SerializerDataCollector.php
index 671239d28c7..2880dea37d8 100644
--- a/DataCollector/SerializerDataCollector.php
+++ b/DataCollector/SerializerDataCollector.php
@@ -21,7 +21,7 @@
 /**
  * @author Mathias Arlaud <mathias.arlaud@gmail.com>
  *
- * @internal
+ * @final
  */
 class SerializerDataCollector extends DataCollector implements LateDataCollectorInterface
 {
diff --git a/Debug/TraceableEncoder.php b/Debug/TraceableEncoder.php
index 0795d14ca0c..afefee0ee6f 100644
--- a/Debug/TraceableEncoder.php
+++ b/Debug/TraceableEncoder.php
@@ -23,7 +23,7 @@
  *
  * @author Mathias Arlaud <mathias.arlaud@gmail.com>
  *
- * @internal
+ * @final
  */
 class TraceableEncoder implements EncoderInterface, DecoderInterface, SerializerAwareInterface
 {
diff --git a/Debug/TraceableNormalizer.php b/Debug/TraceableNormalizer.php
index 50842a7b92f..1aa78804917 100644
--- a/Debug/TraceableNormalizer.php
+++ b/Debug/TraceableNormalizer.php
@@ -24,7 +24,7 @@
  *
  * @author Mathias Arlaud <mathias.arlaud@gmail.com>
  *
- * @internal
+ * @final
  */
 class TraceableNormalizer implements NormalizerInterface, DenormalizerInterface, SerializerAwareInterface, NormalizerAwareInterface, DenormalizerAwareInterface
 {
diff --git a/Debug/TraceableSerializer.php b/Debug/TraceableSerializer.php
index 9cf7bad80bd..898e8956077 100644
--- a/Debug/TraceableSerializer.php
+++ b/Debug/TraceableSerializer.php
@@ -23,7 +23,7 @@
  *
  * @author Mathias Arlaud <mathias.arlaud@gmail.com>
  *
- * @internal
+ * @final
  */
 class TraceableSerializer implements SerializerInterface, NormalizerInterface, DenormalizerInterface, EncoderInterface, DecoderInterface
 {
diff --git a/NameConverter/MetadataAwareNameConverter.php b/NameConverter/MetadataAwareNameConverter.php
index bc693bd903b..eec3b42ce5e 100644
--- a/NameConverter/MetadataAwareNameConverter.php
+++ b/NameConverter/MetadataAwareNameConverter.php
@@ -43,10 +43,6 @@ public function __construct(
 
     public function normalize(string $propertyName, ?string $class = null, ?string $format = null, array $context = []): string
     {
-        $class = 1 < \func_num_args() ? func_get_arg(1) : null;
-        $format = 2 < \func_num_args() ? func_get_arg(2) : null;
-        $context = 3 < \func_num_args() ? func_get_arg(3) : [];
-
         if (null === $class) {
             return $this->normalizeFallback($propertyName, $class, $format, $context);
         }
@@ -60,10 +56,6 @@ public function normalize(string $propertyName, ?string $class = null, ?string $
 
     public function denormalize(string $propertyName, ?string $class = null, ?string $format = null, array $context = []): string
     {
-        $class = 1 < \func_num_args() ? func_get_arg(1) : null;
-        $format = 2 < \func_num_args() ? func_get_arg(2) : null;
-        $context = 3 < \func_num_args() ? func_get_arg(3) : [];
-
         if (null === $class) {
             return $this->denormalizeFallback($propertyName, $class, $format, $context);
         }
diff --git a/Normalizer/AbstractObjectNormalizer.php b/Normalizer/AbstractObjectNormalizer.php
index 3275d976a10..63068420ba1 100644
--- a/Normalizer/AbstractObjectNormalizer.php
+++ b/Normalizer/AbstractObjectNormalizer.php
@@ -767,6 +767,12 @@ private function validateAndDenormalize(Type $type, string $currentClass, string
                                 $class = null;
                             }
                         }
+                    } elseif ($t instanceof ObjectType) {
+                        $typeIdentifier = TypeIdentifier::OBJECT;
+                        $class = $t->getClassName();
+                    } else {
+                        $typeIdentifier = $t->getTypeIdentifier();
+                        $class = null;
                     }
                 } else {
                     if ($t instanceof ObjectType) {
diff --git a/Tests/Encoder/CsvEncoderTest.php b/Tests/Encoder/CsvEncoderTest.php
index 13c0dcc08d0..c0be73a8bd6 100644
--- a/Tests/Encoder/CsvEncoderTest.php
+++ b/Tests/Encoder/CsvEncoderTest.php
@@ -149,7 +149,7 @@ public function testEncodeCustomSettings()
         $this->encoder = new CsvEncoder([
             CsvEncoder::DELIMITER_KEY => ';',
             CsvEncoder::ENCLOSURE_KEY => "'",
-            CsvEncoder::ESCAPE_CHAR_KEY => '|',
+            CsvEncoder::ESCAPE_CHAR_KEY => '',
             CsvEncoder::KEY_SEPARATOR_KEY => '-',
         ]);
 
@@ -175,7 +175,7 @@ public function testEncodeCustomSettingsPassedInContext()
             , $this->encoder->encode($value, 'csv', [
                 CsvEncoder::DELIMITER_KEY => ';',
                 CsvEncoder::ENCLOSURE_KEY => "'",
-                CsvEncoder::ESCAPE_CHAR_KEY => '|',
+                CsvEncoder::ESCAPE_CHAR_KEY => '',
                 CsvEncoder::KEY_SEPARATOR_KEY => '-',
             ]));
     }
@@ -185,7 +185,7 @@ public function testEncodeCustomSettingsPassedInConstructor()
         $encoder = new CsvEncoder([
             CsvEncoder::DELIMITER_KEY => ';',
             CsvEncoder::ENCLOSURE_KEY => "'",
-            CsvEncoder::ESCAPE_CHAR_KEY => '|',
+            CsvEncoder::ESCAPE_CHAR_KEY => '',
             CsvEncoder::KEY_SEPARATOR_KEY => '-',
         ]);
         $value = ['a' => 'he\'llo', 'c' => ['d' => 'foo']];
@@ -574,7 +574,7 @@ public function testDecodeCustomSettings()
         $this->encoder = new CsvEncoder([
             CsvEncoder::DELIMITER_KEY => ';',
             CsvEncoder::ENCLOSURE_KEY => "'",
-            CsvEncoder::ESCAPE_CHAR_KEY => '|',
+            CsvEncoder::ESCAPE_CHAR_KEY => '',
             CsvEncoder::KEY_SEPARATOR_KEY => '-',
         ]);
 
@@ -596,7 +596,7 @@ public function testDecodeCustomSettingsPassedInContext()
             , 'csv', [
                 CsvEncoder::DELIMITER_KEY => ';',
                 CsvEncoder::ENCLOSURE_KEY => "'",
-                CsvEncoder::ESCAPE_CHAR_KEY => '|',
+                CsvEncoder::ESCAPE_CHAR_KEY => '',
                 CsvEncoder::KEY_SEPARATOR_KEY => '-',
             ]));
     }
@@ -606,7 +606,7 @@ public function testDecodeCustomSettingsPassedInConstructor()
         $encoder = new CsvEncoder([
             CsvEncoder::DELIMITER_KEY => ';',
             CsvEncoder::ENCLOSURE_KEY => "'",
-            CsvEncoder::ESCAPE_CHAR_KEY => '|',
+            CsvEncoder::ESCAPE_CHAR_KEY => '',
             CsvEncoder::KEY_SEPARATOR_KEY => '-',
             CsvEncoder::AS_COLLECTION_KEY => true, // Can be removed in 5.0
         ]);
diff --git a/Tests/NameConverter/CamelCaseToSnakeCaseNameConverterTest.php b/Tests/NameConverter/CamelCaseToSnakeCaseNameConverterTest.php
index fc9967f0c5f..d1edc2325d7 100644
--- a/Tests/NameConverter/CamelCaseToSnakeCaseNameConverterTest.php
+++ b/Tests/NameConverter/CamelCaseToSnakeCaseNameConverterTest.php
@@ -61,9 +61,9 @@ public static function attributeProvider()
     public function testDenormalizeWithContext()
     {
         $nameConverter = new CamelCaseToSnakeCaseNameConverter(null, true);
-        $denormalizedValue = $nameConverter->denormalize('last_name', null, null, [CamelCaseToSnakeCaseNameConverter::REQUIRE_SNAKE_CASE_PROPERTIES]);
+        $denormalizedValue = $nameConverter->denormalize('last_name', null, null, [CamelCaseToSnakeCaseNameConverter::REQUIRE_SNAKE_CASE_PROPERTIES => true]);
 
-        $this->assertSame($denormalizedValue, 'lastName');
+        $this->assertSame('lastName', $denormalizedValue);
     }
 
     public function testErrorDenormalizeWithContext()
diff --git a/Tests/Normalizer/AbstractObjectNormalizerTest.php b/Tests/Normalizer/AbstractObjectNormalizerTest.php
index e1b1031dabe..a666185dd6a 100644
--- a/Tests/Normalizer/AbstractObjectNormalizerTest.php
+++ b/Tests/Normalizer/AbstractObjectNormalizerTest.php
@@ -1224,6 +1224,29 @@ public function provideDenormalizeWithFilterBoolData(): array
             [['foo' => 'something'], null],
         ];
     }
+
+    public function testDenormalizeArrayObject()
+    {
+        $normalizer = new class() extends AbstractObjectNormalizerDummy {
+            public function __construct()
+            {
+                parent::__construct(null, null, new PhpDocExtractor());
+            }
+
+            protected function isAllowedAttribute($classOrObject, string $attribute, ?string $format = null, array $context = []): bool
+            {
+                return true;
+            }
+        };
+        $serializer = new Serializer([$normalizer]);
+        $normalizer->setSerializer($serializer);
+
+        $actual = $normalizer->denormalize(['foo' => ['array' => ['key' => 'value']]], DummyWithArrayObject::class);
+
+        $this->assertInstanceOf(DummyWithArrayObject::class, $actual);
+        $this->assertInstanceOf(\ArrayObject::class, $actual->foo);
+        $this->assertSame(1, $actual->foo->count());
+    }
 }
 
 class AbstractObjectNormalizerDummy extends AbstractObjectNormalizer
@@ -1515,6 +1538,12 @@ class BoolPropertyDummy
     public $foo;
 }
 
+class DummyWithArrayObject
+{
+    /** @var \ArrayObject<string, mixed> */
+    public $foo;
+}
+
 class SerializerCollectionDummy implements SerializerInterface, DenormalizerInterface
 {
     private array $normalizers;