symfony/symfony — comment on commit d02f17268ecd2aed4730d4eb557733d5e038ed2e
File: tests/Symfony/Tests/Component/Form/Extension/Core/EventListener/MergeCollectionListenerCustomArrayObjectTest.php line 24
By stof:

@vicb I know it is not strictly equivalent. But the tests never pass ``null`` AFAIK. The default value is only there to make it optional to pass an empty array.