Getting destination from $_REQUEST

(This was posted in another thread. Was told to repost under separate cover as own thread.)

i had to patch (or at least i think i had to) drupal_goto checks on destination ($_REQUEST['destination'] and $_REQUEST['edit']['destination']) in common.inc so that tests for value occur via isset, rather than via shorthand true/false.

the problem--at least with logintoboggan access denied login pages enabled, and with anonymous access totally disallowed, and destination slated for drupal root--is that drupal root (ie, null) would evaluate to false and hence cause redirect to user page upon successful login.