Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/vendor/symfony/serializer/SerializerInterface.php

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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Serializer;
+
+/**
+ * Defines the interface of the Serializer.
+ *
+ * @author Jordi Boggiano <j.boggiano@seld.be>
+ */
+interface SerializerInterface
+{
+    /**
+     * Serializes data in the appropriate format.
+     *
+     * @param mixed  $data    any data
+     * @param string $format  format name
+     * @param array  $context options normalizers/encoders have access to
+     *
+     * @return string
+     */
+    public function serialize($data, $format, array $context = array());
+
+    /**
+     * Deserializes data into the given type.
+     *
+     * @param mixed  $data
+     * @param string $type
+     * @param string $format
+     * @param array  $context
+     *
+     * @return object
+     */
+    public function deserialize($data, $type, $format, array $context = array());
+}