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/url_helper.php b/system/helpers/url_helper.php
index 8e93744..d0516ce 100644
--- a/system/helpers/url_helper.php
+++ b/system/helpers/url_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
  *
@@ -286,7 +286,7 @@
 			{
 				foreach ($attributes as $key => $val)
 				{
-					$x[] = ' '.$key.'="';
+					$x[] =  ' '.$key.'="';
 					for ($i = 0; $i < strlen($val); $i++)
 					{
 						$x[] = "|".ord(substr($val, $i, 1));
@@ -363,7 +363,7 @@
  *
  * Automatically links URL and Email addresses.
  * Note: There's a bit of extra code here to deal with
- * URLs or emails that end in a period. We'll strip these
+ * URLs or emails that end in a period.  We'll strip these
  * off and add them after the link.
  *
  * @access	public