Ticket #20712: 20712.patch

wp-includes/option.php

@@ -229 +229 @@
         $newvalue = apply_filters( 'pre_update_option_' . $option, $newvalue, $oldvalue );
 
         // If the new and old values are the same, no need to update.
-        if ( $newvalue === $oldvalue )
+        if ( $newvalue === $oldvalue || $newvalue === sanitize_option( $option, $oldvalue ) )
                 return false;
 
         if ( false === $oldvalue )