diff --git a/lib/Cake/Cache/Cache.php b/lib/Cake/Cache/Cache.php
index 2cba7dadc..aa00f542d 100644
--- a/lib/Cake/Cache/Cache.php
+++ b/lib/Cake/Cache/Cache.php
@@ -278,7 +278,7 @@ class Cache {
  * @return void
  */
 	public static function gc($config = 'default', $expires = null) {
-		static::$_engines[$config]->gc($expires);
+		return (bool)static::$_engines[$config]->gc($expires);
 	}
 
 /**
@@ -452,7 +452,7 @@ class Cache {
 
 		$success = static::$_engines[$config]->delete($settings['prefix'] . $key);
 		static::set(null, $config);
-		return $success;
+		return (bool)$success;
 	}
 
 /**
diff --git a/lib/Cake/Model/Datasource/CakeSession.php b/lib/Cake/Model/Datasource/CakeSession.php
index b3b471686..fe601b4d3 100644
--- a/lib/Cake/Model/Datasource/CakeSession.php
+++ b/lib/Cake/Model/Datasource/CakeSession.php
@@ -143,7 +143,7 @@ class CakeSession {
 	public static function init($base = null) {
 		static::$time = time();
 
-		if (env('HTTP_USER_AGENT')) {
+		if (env('HTTP_USER_AGENT') && !static::$_userAgent) {
 			static::$_userAgent = md5(env('HTTP_USER_AGENT') . Configure::read('Security.salt'));
 		}
 
diff --git a/lib/Cake/Model/Datasource/Session/CacheSession.php b/lib/Cake/Model/Datasource/Session/CacheSession.php
index 793701992..d0540bcb7 100644
--- a/lib/Cake/Model/Datasource/Session/CacheSession.php
+++ b/lib/Cake/Model/Datasource/Session/CacheSession.php
@@ -83,7 +83,7 @@ class CacheSession implements CakeSessionHandlerInterface {
  * @return bool Success
  */
 	public function gc($expires = null) {
-		return Cache::gc(Configure::read('Session.handler.config'), $expires);
+		return (bool)Cache::gc(Configure::read('Session.handler.config'), $expires);
 	}
 
 }
diff --git a/lib/Cake/Model/Datasource/Session/DatabaseSession.php b/lib/Cake/Model/Datasource/Session/DatabaseSession.php
index 81cd708e8..f5626808b 100644
--- a/lib/Cake/Model/Datasource/Session/DatabaseSession.php
+++ b/lib/Cake/Model/Datasource/Session/DatabaseSession.php
@@ -123,9 +123,9 @@ class DatabaseSession implements CakeSessionHandlerInterface {
 			'counterCache' => false
 		);
 		try {
-			return $this->_model->save($record, $options);
+			return (bool)$this->_model->save($record, $options);
 		} catch (PDOException $e) {
-			return $this->_model->save($record, $options);
+			return (bool)$this->_model->save($record, $options);
 		}
 	}
 
@@ -136,7 +136,7 @@ class DatabaseSession implements CakeSessionHandlerInterface {
  * @return bool True for successful delete, false otherwise.
  */
 	public function destroy($id) {
-		return $this->_model->delete($id);
+		return (bool)$this->_model->delete($id);
 	}
 
 /**
@@ -151,7 +151,7 @@ class DatabaseSession implements CakeSessionHandlerInterface {
 		} else {
 			$expires = time() - $expires;
 		}
-		return $this->_model->deleteAll(array($this->_model->alias . ".expires <" => $expires), false, false);
+		return (bool)$this->_model->deleteAll(array($this->_model->alias . ".expires <" => $expires), false, false);
 	}
 
 }
diff --git a/lib/Cake/Test/test_app/Model/Datasource/Session/TestAppLibSession.php b/lib/Cake/Test/test_app/Model/Datasource/Session/TestAppLibSession.php
index 2ba874dba..4d509d3c4 100644
--- a/lib/Cake/Test/test_app/Model/Datasource/Session/TestAppLibSession.php
+++ b/lib/Cake/Test/test_app/Model/Datasource/Session/TestAppLibSession.php
@@ -12,6 +12,7 @@ class TestAppLibSession implements CakeSessionHandlerInterface {
 	}
 
 	public function close() {
+		return true;
 	}
 
 	public function read($id) {
@@ -21,9 +22,12 @@ class TestAppLibSession implements CakeSessionHandlerInterface {
 	}
 
 	public function destroy($id) {
+		return true;
 	}
 
 	public function gc($expires = null) {
+		return true;
 	}
 
+
 }
diff --git a/lib/Cake/Test/test_app/Plugin/TestPlugin/Model/Datasource/Session/TestPluginSession.php b/lib/Cake/Test/test_app/Plugin/TestPlugin/Model/Datasource/Session/TestPluginSession.php
index acad188e0..92a2817a1 100644
--- a/lib/Cake/Test/test_app/Plugin/TestPlugin/Model/Datasource/Session/TestPluginSession.php
+++ b/lib/Cake/Test/test_app/Plugin/TestPlugin/Model/Datasource/Session/TestPluginSession.php
@@ -12,6 +12,7 @@ class TestPluginSession implements CakeSessionHandlerInterface {
 	}
 
 	public function close() {
+		return true;
 	}
 
 	public function read($id) {
@@ -21,9 +22,11 @@ class TestPluginSession implements CakeSessionHandlerInterface {
 	}
 
 	public function destroy($id) {
+		return true;
 	}
 
 	public function gc($expires = null) {
+		return true;
 	}
 
 }