+ /**
+ * Define fields that are deprecated for use with this class.
+ * @var (string|null)[] Keys are '$key', value is null for soft deprecation
+ * or a string naming the deprecated version for hard deprecation.
+ */
+ private static $deprecated = [
+ 'ar_user' => null, // 1.34
+ 'img_user' => null, // 1.34
+ 'oi_user' => null, // 1.34
+ 'fa_user' => null, // 1.34
+ 'rc_user' => null, // 1.34
+ 'log_user' => null, // 1.34
+ 'ipb_by' => null, // 1.34
+ ];
+
+ /**
+ * Define fields that are removed for use with this class.
+ * @var string[] Keys are '$key', value is the MediaWiki version in which
+ * use was removed.
+ */
+ private static $removed = [];
+