/// <summary>
 /// Get the specified range from the wrapped collection.
 /// (The current implementation erroneously does not wrap the result.)
 /// </summary>
 /// <param name="bot"></param>
 /// <param name="top"></param>
 /// <returns></returns>
 public new IDirectedCollectionValue <T> RangeFromTo(T bot, T top)
 {
     return(indexedsorted.RangeFromTo(bot, top));
 }