Symfony's Serializer null handling

serializer-test-null.php

<?php
<<<CONFIG
packages:
    - "symfony/serializer: ~2.6"
CONFIG;

use Symfony\Component\Serializer\Serializer;
use Symfony\Component\Serializer\Encoder\XmlEncoder;
use Symfony\Component\Serializer\Encoder\JsonEncoder;
use Symfony\Component\Serializer\Normalizer\GetSetMethodNormalizer;

$encoders = array(new XmlEncoder(), new JsonEncoder());
$normalizers = array(new GetSetMethodNormalizer());

$serializer = new Serializer($normalizers, $encoders);


class T 
{
    public function getA()
    {
        return null;
    }
}

echo $serializer->serialize(new T(), 'json') . PHP_EOL;
// Output: {"a":null}