public static NullableDataSourceStandard <OptionalCollectionNullableStateValidator <TValue>, UniqueValidator <TValue>, TValue[]> Unique <TValue>(this OptionalCollectionNullableStateValidator <TValue> source) => source.Add(new UniqueValidator <TValue>());
public static NullableDataSourceStandard <OptionalCollectionNullableStateValidator <TValue>, ItemCountValidator <TValue>, TValue[]> ItemCount <TValue>(this OptionalCollectionNullableStateValidator <TValue> source, int?minimumItems = null, int?maximumItems = null) => source.Add(new ItemCountValidator <TValue>(minimumItems, maximumItems));
public static NullableDataSourceStandard <OptionalCollectionNullableStateValidator <TValue>, CustomValidator <TValue[]>, TValue[]> Assert <TValue>(this OptionalCollectionNullableStateValidator <TValue> source, string description, Func <TValue[], bool> validator) => source.Add(new CustomValidator <TValue[]>(description, validator));