explicitly define callable methods

It's an easy-win performance gain (by avoiding the use of reflections)

Cake/Model/Behavior/TimestampBehavior.php

@@ -110,6 +110,32 @@ public function implementedEvents() {
 		return array_fill_keys(array_keys($this->_settings['events']), 'handleEvent');
 	}
 
+/**
+ * implementedFinders
+ *
+ * This behavior does not implement any finders
+ *
+ * @return array
+ */
+	public function implementedFinders() {
+		return [];
+	}
+
+/**
+ * implementedMethods
+ *
+ * Only the timestamp method is callable from a table.
+ *
+ * @return void
+ */
+	public function implementedMethods() {
+		if (isset($this->_settings['implementedMethods'])) {
+			return $this->_settings['implementedMethods'];
+		}
+
+		return ['timestamp' => 'timestamp'];
+	}
+
 /**
  * Get or set the timestamp to be used
  *