Bug in Zend\Cache or Zend\EventManager

example-21.php

<?php
namespace {
    require_once 'ZendFramework/library/Zend/Loader/StandardAutoloader.php';
    $autoloader = new \Zend\Loader\StandardAutoloader;
    spl_autoload_register(array($autoloader, 'autoload'));

    $di = new Zend\Di\Di;
    $di->configure(
        new Zend\Di\Configuration(
            array(
                'definition' => array(
                    'class' => array(
                    	'Zend\Cache\Storage\Adapter\Memcached' => array(
                            'instantiator' => array(
                                'Zend\Cache\StorageFactory',
                                'factory',
                            ),
                        ),
                        'Zend\Cache\StorageFactory' => array(
                            'methods' => array(
                                'factory' => array(
                                    'required' => true,
                                    'cfg' => array(
                                        'required' => true,
                                    ),
                                ),
                            ),
                        ),
                    ),
                ),
                'instance' => array(
                    'preferences' => array(
                        // Use EventManager for EventCollection
                        'Zend\EventManager\EventCollection' => 'Zend\EventManager\EventManager',
                        // Use SharedEventManager for SharedEventCollection
                        'Zend\EventManager\SharedEventCollection' => 'Zend\EventManager\SharedEventManager',
                    ),
                    'Zend\EventManager\EventManager' => array(
                        'shared' => false, // new instance per class needing an instance
                    ),
                    'Zend\Cache\Storage\Adapter\Memcached' => array(
                        'parameters' => array(
                            'cfg' => array(
                                'adapter' => array(
                                    'name' => 'Zend\Cache\Storage\Adapter\Memcached',
                                    'options' => array(
                                        'namespace' => 'phantom-services',
                                        'ttl' => 3600,
                                    ),
                                ),
                                'plugins' => array(
                                    'serializer',
                                ),
                            ),
                        ),
                    ),
                ),
            )
        )
    );

    $memcached = $di->get('Zend\Cache\Storage\Adapter\Memcached');

}