Possible to make circular reference in menu-otf

This bug kills Drupal. When using the "Menu settings" fieldset to link a page into a menu (formerly menu-otf), the page that you are currently editing shows up in the list of available selections. If you choose that one, you end up with mid = pid in the menu table, and viewing the page becomes impossible. Drupal enters an endless loop and Apache eventually sends a timeout. The solution is to deactivate the option in the select so that it cannot be selected, or remove it altogether (less ideal). In any case, it should never be possible to have mid = pid in the menu table (is this something we can enforce at the database level?)