Index: trunk/src/wp-includes/user.php
===================================================================
--- trunk/src/wp-includes/user.php	(revision 63941)
+++ trunk/src/wp-includes/user.php	(revision 64163)
@@ -750,4 +750,6 @@
  * @param string $deprecated Use get_option() to check for an option in the options table.
  * @return mixed User option value on success, false on failure.
+ *
+ * @phpstan-param '' $deprecated
  */
 function get_user_option( $option, $user = 0, $deprecated = '' ) {