The file cache entry is array accessible

… so let's make this part of our API. We use it as array already.

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

lib/private/Files/Cache/CacheEntry.php

@@ -27,7 +27,7 @@ use OCP\Files\Cache\ICacheEntry;
 /**
  * meta data for a file or folder
  */
-class CacheEntry implements ICacheEntry, \ArrayAccess {
+class CacheEntry implements ICacheEntry {
 	/**
 	 * @var array
 	 */

lib/public/Files/Cache/ICacheEntry.php

@@ -23,12 +23,18 @@
 
 namespace OCP\Files\Cache;
 
+use ArrayAccess;
+
 /**
  * meta data for a file or folder
  *
  * @since 9.0.0
+ *
+ * This interface extends \ArrayAccess since v21.0.0, previous versions only
+ * implemented it in the private implementation. Hence php would allow using the
+ * object as array, while strictly speaking it didn't support this.
  */
-interface ICacheEntry {
+interface ICacheEntry extends ArrayAccess {
 	public const DIRECTORY_MIMETYPE = 'httpd/unix-directory';
 
 	/**