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diff --git a/vendor/drush/drush/src/Cache/CacheInterface.php b/vendor/drush/drush/src/Cache/CacheInterface.php
new file mode 100644
index 000000000..5cf54469e
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+++ b/vendor/drush/drush/src/Cache/CacheInterface.php
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+<?php
+
+/**
+ * @file
+ * Definition of Drush\Cache\CacheInterface.
+ */
+
+namespace Drush\Cache;
+
+/**
+ * Interface for cache implementations.
+ *
+ * All cache implementations have to implement this interface.
+ * JSONCache provides the default implementation, which can be
+ * consulted as an example.
+ *
+ * To make Drush use your implementation for a certain cache bin, you have to
+ * set a variable with the name of the cache bin as its key and the name of
+ * your class as its value. For example, if your implementation of
+ * CacheInterface was called MyCustomCache, the following line in
+ * drushrc.php would make Drush use it for the 'example' bin:
+ * @code
+ *  $options['cache-class-example'] = 'MyCustomCache;
+ * @endcode
+ *
+ * Additionally, you can register your cache implementation to be used by
+ * default for all cache bins by setting the option 'cache-default-class' to
+ * the name of your implementation of the CacheInterface, e.g.
+ * @code
+ *  $options['cache-default-class'] = 'MyCustomCache;
+ * @endcode
+ *
+ * @see \Drupal\Core\Cache\CacheBackendInterface
+ *
+ * @deprecated
+ */
+interface CacheInterface
+{
+
+    /**
+     * Constructor.
+     *
+     * @param $bin
+     *   The cache bin for which the object is created.
+     */
+    public function __construct($bin);
+
+    /**
+     * Return data from the persistent cache.
+     *
+     * @param string $cid
+     *   The cache ID of the data to retrieve.
+     *
+     * @return
+     *   The cache or FALSE on failure.
+     */
+    public function get($cid);
+
+    /**
+     * Return data from the persistent cache when given an array of cache IDs.
+     *
+     * @param array $cids
+     *   An array of cache IDs for the data to retrieve. This is passed by
+     *   reference, and will have the IDs successfully returned from cache
+     *   removed.
+     *
+     * @return
+     *   An array of the items successfully returned from cache indexed by cid.
+     */
+    public function getMultiple(&$cids);
+
+    /**
+     * Store data in the persistent cache.
+     *
+     * @param string $cid
+     *   The cache ID of the data to store.
+     * @param array $data
+     *   The data to store in the cache.
+     * @param $expire
+     *   One of the following values:
+     *   - DRUSH_CACHE_PERMANENT: Indicates that the item should never be removed unless
+     *     explicitly told to using _drush_cache_clear_all() with a cache ID.
+     *   - DRUSH_CACHE_TEMPORARY: Indicates that the item should be removed at the next
+     *     general cache wipe.
+     *   - A Unix timestamp: Indicates that the item should be kept at least until
+     *     the given time, after which it behaves like CACHE_TEMPORARY.
+     */
+    public function set($cid, $data, $expire = DRUSH_CACHE_PERMANENT);
+
+    /**
+     * Expire data from the cache. If called without arguments, expirable
+     * entries will be cleared from all known cache bins.
+     *
+     * @param string $cid
+     *   If set, the cache ID to delete. Otherwise, all cache entries that can
+     *   expire are deleted.
+     * @param bool $wildcard
+     *   If set to TRUE, the $cid is treated as a substring
+     *   to match rather than a complete ID. The match is a right hand
+     *   match. If '*' is given as $cid, the bin $bin will be emptied.
+     */
+    public function clear($cid = null, $wildcard = false);
+
+    /**
+     * Check if a cache bin is empty.
+     *
+     * A cache bin is considered empty if it does not contain any valid data for
+     * any cache ID.
+     *
+     * @return
+     *   TRUE if the cache bin specified is empty.
+     */
+    public function isEmpty();
+}