Bug with array_merge_recursive

I'm trying to do something like this:

$config1 = [
    'factories`=> [
        // factories
    ],
    'lazy_services' => [
        'class_map' => [
            'Foo' => 'Foo',
        ],
    ],
];

$config2 = [
    'factories`=> [
        // factories
    ],
    'lazy_services' => [
        'class_map' => [
            'Foo' => 'Foo',
        ],
    ],
];

$container = new ServiceManager($config1);
$container->configure($config2);

This will result on internal lazy_services property the following:

$this->lazy_services = [
    'class_map' => [
        'Foo' => [
            'Foo',
            'Foo',
        ],
    ].
];

The problem is the use of array_merge_recursive() function in this line.

Same problem with delegators property.

I found this issue using zend-mvc and an already configured container, then Zend\ModuleManager\Listener\ServiceListener reconfigure it adding configuration from ModuleManager features.

zendframework / zend-servicemanager

Bug with array_merge_recursive #279