class Test
{
     public function __construct(private SerializerInterface $serializer)
    {
    }

    public function test() {
        $object = new class(){
            public array $array = [];
        };
        
        $data = $this->serializer->serialize($object, 'xml');

        /**
         * $data is:
         * <?xml version="1.0"?>
         * <response>
         *  <array/>
         * </response>
         */

        $this->serializer->deserialize($data, get_class($object), 'xml');

        // :boom: 
        //  [Symfony\Component\Serializer\Exception\NotNormalizableValueException]                                  
        //  The type of the "array" attribute for class "class@anonymous" must be one of "array" ("string" given). 
    }