Typing IHandler methods, typing Handler_Public, fix type of $feed_id (might be tag).

classes/handler/administrative.php

@@ -1,6 +1,6 @@
 <?php
 class Handler_Administrative extends Handler_Protected {
-   function before($method) {
+   function before(string $method): bool {
       if (parent::before($method)) {
          if (($_SESSION["access_level"] ?? 0) >= UserHelper::ACCESS_LEVEL_ADMIN) {
             return true;