backed out 648b42a75739, which was a NON-trivial whitespace commit.  It broke the Typography class's string replacements, for instance
diff --git a/system/core/URI.php b/system/core/URI.php
index 94fac59..d565486 100644
--- a/system/core/URI.php
+++ b/system/core/URI.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
  *
@@ -36,7 +36,7 @@
 	/**
 	 * Constructor
 	 *
-	 * Simply globalizes the $RTR object. The front
+	 * Simply globalizes the $RTR object.  The front
 	 * loads the Router class early on so it's not available
 	 * normally as other classes are.
 	 *
@@ -85,7 +85,7 @@
 			}
 
 			// No PATH_INFO?... What about QUERY_STRING?
-			$path = (isset($_SERVER['QUERY_STRING'])) ? $_SERVER['QUERY_STRING'] : @getenv('QUERY_STRING');
+			$path =  (isset($_SERVER['QUERY_STRING'])) ? $_SERVER['QUERY_STRING'] : @getenv('QUERY_STRING');
 			if (trim($path, '/') != '')
 			{
 				$this->_set_uri_string($path);
@@ -251,7 +251,7 @@
 	 */
 	function _remove_url_suffix()
 	{
-		if ($this->config->item('url_suffix') != "")
+		if  ($this->config->item('url_suffix') != "")
 		{
 			$this->uri_string = preg_replace("|".preg_quote($this->config->item('url_suffix'))."$|", "", $this->uri_string);
 		}
@@ -285,7 +285,7 @@
 	 * Re-index Segments
 	 *
 	 * This function re-indexes the $this->segment array so that it
-	 * starts at 1 rather than 0. Doing so makes it simpler to
+	 * starts at 1 rather than 0.  Doing so makes it simpler to
 	 * use functions like $this->uri->segment(n) since there is
 	 * a 1:1 relationship between the segment array and the actual segments.
 	 *
@@ -323,7 +323,7 @@
 	 * Fetch a URI "routed" Segment
 	 *
 	 * This function returns the re-routed URI segment (assuming routing rules are used)
-	 * based on the number provided. If there is no routing this function returns the
+	 * based on the number provided.  If there is no routing this function returns the
 	 * same result as $this->segment()
 	 *
 	 * @access	public
@@ -425,7 +425,7 @@
 
 		$i = 0;
 		$lastval = '';
-		$retval = array();
+		$retval  = array();
 		foreach ($segments as $seg)
 		{
 			if ($i % 2)