public IList <T> ToList() { return(EmptyList.Empty <T>()); }
public T[] ToArray() { return(EmptyList.EmptyArray <T>()); }
public IList <V> Values() { return(EmptyList.Empty <V>()); }
public V[] ToArray() { return(EmptyList.EmptyArray <V>()); }
public IList <K> KeyList() { return(EmptyList.Empty <K>()); }