fun <E : Any, T : Iterable<E?>> containsNullable(plant: Assert<T>, assertionCreator: (Assert<E>.() -> Unit)?): AssertionPlant<T>
fun <E : Any, T : Iterable<E?>> containsNullable(plant: Assert<T>, entries: Entries<E, (Assert<E>.() -> Unit)?>): AssertionPlant<T>