anchor.diff:  
     ParseUser(this.builder, this.applicationId, this.secretKey) {}
   
  -  Future signup(String username, String password,
  -    {Map<String, Object> properties: null, String revocableSession:"1", String version: "1"}) async {
  +  Future signup(String username, String password, {Map<String, Object> properties: null, String revocableSession: "1", String version: "1"}) async {
       if (properties == null) {
         properties = {};
       }
  
positive.code:     return new SignUpUserResult.fromResponse(resonse);
    }
  
    Future<LoginUserResult> login(String username, String password,
      {String revocableSession:"1", String version: "1"}) async {
      TinyNetRequester requester = await this.builder.createRequester();
  
      TinyNetRequesterResponse resonse = await requester.request(
          TinyNetRequester.TYPE_GET, //
          Uri.encodeFull("https://api.parse.com/${version}/login?username=${username}&password=${password}"), //
          headers: {
            "X-Parse-Application-Id": applicationId, //
            "X-Parse-REST-API-Key": secretKey, //
            "X-Parse-Revocable-Session": revocableSession, //
            "Content-Type": "application/json" //
          }
          );
      return new LoginUserResult.fromResponse(resonse);
    }
  
  
negative.code:         TinyNetRequester.TYPE_POST, //
          "https://api.parse.com/${version}/logout", //
          headers: {
        "X-Parse-Application-Id": applicationId, //
        "X-Parse-REST-API-Key": secretKey, //
        "X-Parse-Session-Token": seesionToken, //
      });
      return new LogoutUserResult.fromResponse(resonse);
    }
  
  