ArgumentsSerialization.php

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<?php
namespace Magento\Setup\Module\Di\Compiler\Config\Chain;

use Magento\Setup\Module\Di\Compiler\Config\ModificationInterface;
use Magento\Framework\Serialize\SerializerInterface;
use Magento\Framework\App\ObjectManager;
use Magento\Framework\Serialize\Serializer\Json;

class ArgumentsSerialization implements ModificationInterface
{
    private $serializer;

    public function __construct(SerializerInterface $serializer = null)
    {
        $this->serializer = $serializer ?: ObjectManager::getInstance()->get(Json::class);
    }

    public function modify(array $config)
    {
        if (!isset($config['arguments'])) {
            return $config;
        }

        foreach ($config['arguments'] as $key => $value) {
            if ($value !== null) {
                $config['arguments'][$key] = $this->serializer->serialize($value);
            }
        }

        return $config;
    }
}