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

@vicb When I said ``null`` was never used, I meant explictly. It is called relying on the default value. But this would work if it is set as an empty array directly