public int Compare(TKey2 x, TKey2 y)
{
var comparer = _source.Inner.Comparer;
var x1 = _source.ToKey(x);
var y1 = _source.ToKey(y);
return(comparer.Compare(x1, y1));
}
public bool MoveAt(TKey2 key, Lookup direction)
{
return(_innerCursor.MoveAt(_source.ToKey(key), direction));
}