adding type casting of $title argument in URL helper functions to a string. A numeric 0 sent to these functions would evaluate if ($title == '') as TRUE, and type casting seems the more appropriate fix than simply using $title === '', since we're expecting and treating $title as a string.
diff --git a/user_guide/changelog.html b/user_guide/changelog.html
index eb57d48..67baae4 100644
--- a/user_guide/changelog.html
+++ b/user_guide/changelog.html
@@ -89,6 +89,7 @@
<li>Modified the Router so that when Query Strings are Enabled, the controller trigger and function trigger values are sanitized for filename include security.</li>
<li>Modified the is_image() method in the Upload library to take into account Windows IE 6/7 eccentricities when dealing with MIMEs</li>
<li>Modified XSS Cleaning routine to be more performance friendly and compatible with PHP 5.2's new PCRE backtrack and recursion limits.</li>
+ <li>Modified the URL Helper to type cast the $title as a string in case a numeric value is supplied</li>
<li>Deprecated the use if <kbd>is_numeric()</kbd> in various places since it allows periods. Due to compatibility problems with <kbd>ctype_digit()</kbd>, making it unreliable in some installations, the following regular expression was used instead: <kbd>preg_match("/[^0-9]/", $n)</kbd></li>
<li>Deprecated: APPVER has been deprecated and replaced with CI_VERSION for clarity. </li>
</ul>