static void TestMerge(string s_parent, string s_left, string s_right)
        {
            Hashtable parent = Sjson(s_parent);
            Hashtable left   = Sjson(s_left);
            Hashtable right  = Sjson(s_right);

            Hashtable res = JsonDiff.Merge(parent, left, right);

            System.Diagnostics.Debug.WriteLine(SJSON.Encode(res));
        }