backed out 648b42a75739, which was a NON-trivial whitespace commit.  It broke the Typography class's string replacements, for instance
diff --git a/system/helpers/captcha_helper.php b/system/helpers/captcha_helper.php
index 130c2c7..19ec0c7 100644
--- a/system/helpers/captcha_helper.php
+++ b/system/helpers/captcha_helper.php
@@ -1,4 +1,4 @@
-<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
+<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
 /**
  * CodeIgniter
  *
@@ -106,8 +106,8 @@
 		// Do we have a "word" yet?
 		// -----------------------------------
 
-	  if ($word == '')
-	  {
+	   if ($word == '')
+	   {
 			$pool = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
 
 			$str = '';
@@ -117,7 +117,7 @@
 			}
 
 			$word = $str;
-	  }
+	   }
 
 		// -----------------------------------
 		// Determine angle and position
@@ -143,7 +143,7 @@
 		}
 
 		// -----------------------------------
-		// Assign colors
+		//  Assign colors
 		// -----------------------------------
 
 		$bg_color		= imagecolorallocate ($im, 255, 255, 255);
@@ -153,13 +153,13 @@
 		$shadow_color	= imagecolorallocate($im, 255, 240, 240);
 
 		// -----------------------------------
-		// Create the rectangle
+		//  Create the rectangle
 		// -----------------------------------
 
 		ImageFilledRectangle($im, 0, 0, $img_width, $img_height, $bg_color);
 
 		// -----------------------------------
-		// Create the spiral pattern
+		//  Create the spiral pattern
 		// -----------------------------------
 
 		$theta		= 1;
@@ -183,7 +183,7 @@
 		}
 
 		// -----------------------------------
-		// Write the text
+		//  Write the text
 		// -----------------------------------
 
 		$use_font = ($font_path != '' AND file_exists($font_path) AND function_exists('imagettftext')) ? TRUE : FALSE;
@@ -219,13 +219,13 @@
 
 
 		// -----------------------------------
-		// Create the border
+		//  Create the border
 		// -----------------------------------
 
 		imagerectangle($im, 0, 0, $img_width-1, $img_height-1, $border_color);
 
 		// -----------------------------------
-		// Generate the image
+		//  Generate the image
 		// -----------------------------------
 
 		$img_name = $now.'.jpg';