=== modified file 'includes/form.inc'
--- includes/form.inc	2010-11-13 14:04:08 +0000
+++ includes/form.inc	2010-11-17 22:34:33 +0000
@@ -2115,7 +2115,7 @@ function form_type_checkbox_value($eleme
     // common use-case for setting #return_value to either 0 or '0' is for the
     // first option within a 0-indexed array of checkboxes, and for this,
     // form_process_checkboxes() uses the string rather than the integer.
-    return isset($input) ? $element['#return_value'] : 0;
+    return isset($input) ? htmlspecialchars_decode($element['#return_value'], ENT_QUOTES) : 0;
   }
 }