The 'Convert to boolean' plug-in does not work out-of-the-box

This is just a copy/paste from: http://drupal.org/node/1246578#comment-6104694 posted by miltonsp

The 'Convert to boolean' plug-in does not work out-of-the-box in Drupal 7.
Here is a small patch to make it work.

Index: .../feeds/feeds_tamper/plugins/convert_boolean.inc
===================================================================
--- ... /feeds/feeds_tamper/plugins/convert_boolean.inc	
+++ ... /feeds/feeds_tamper/plugins/convert_boolean.inc	
@@ -79,11 +79,11 @@
     $match_field = drupal_strtolower($match_field);
   }
   if ($match_field == $settings['true_value']) {
-    $field = TRUE;
+    $field = 1;
     return;
   }
   if ($match_field == $settings['false_value']) {
-    $field = FALSE;
+    $field = 0;
     return;
   }
   if ($settings['no_match'] == 'pass') {