Revert "Changing where bool is returned"

This reverts commit 8f52cef.

Author: phpnut

lib/Cake/Cache/Cache.php

@@ -278,7 +278,7 @@ public static function set($settings = array(), $value = null, $config = 'defaul
  * @return void
  */
 	public static function gc($config = 'default', $expires = null) {
-		static::$_engines[$config]->gc($expires);
+		return static::$_engines[$config]->gc($expires);
 	}
 
 /**
@@ -452,7 +452,7 @@ public static function delete($key, $config = 'default') {
 
 		$success = static::$_engines[$config]->delete($settings['prefix'] . $key);
 		static::set(null, $config);
-		return $success;
+		return (bool)$success;
 	}
 
 /**

lib/Cake/Model/Datasource/Session/CacheSession.php

@@ -73,7 +73,7 @@ public function write($id, $data) {
  * @return bool True for successful delete, false otherwise.
  */
 	public function destroy($id) {
-		return (bool)Cache::delete($id, Configure::read('Session.handler.config'));
+		return Cache::delete($id, Configure::read('Session.handler.config'));
 	}
 
 /**