Ensure correct type.

framework/yii/helpers/HtmlBase.php

@@ -553,7 +553,7 @@ class HtmlBase
 	 */
 	public static function radio($name, $checked = false, $options = array())
 	{
-		$options['checked'] = $checked;
+		$options['checked'] = (boolean)$checked;
 		$value = array_key_exists('value', $options) ? $options['value'] : '1';
 		if (isset($options['uncheck'])) {
 			// add a hidden field so that if the radio button is not selected, it still submits a value
@@ -582,7 +582,7 @@ class HtmlBase
 	 */
 	public static function checkbox($name, $checked = false, $options = array())
 	{
-		$options['checked'] = $checked;
+		$options['checked'] = (boolean)$checked;
 		$value = array_key_exists('value', $options) ? $options['value'] : '1';
 		if (isset($options['uncheck'])) {
 			// add a hidden field so that if the checkbox is not selected, it still submits a value