Ticket #33451: 33451.patch

src/wp-includes/meta.php

@@ -480 +480 @@
          *                                     or an array of values.
          * @param int               $object_id Object ID.
          * @param string            $meta_key  Meta key.
-         * @param string|array      $single    Meta value, or an array of values.
+         * @param bool              $single    Whether to return only the first
+         *                                     value of the specified $meta_key.
          */
         $check = apply_filters( "get_{$meta_type}_metadata", null, $object_id, $meta_key, $single );
         if ( null !== $check ) {