anchor.diff:    int lifeSpan;
   
     @override
  -  Application application;
  -
  -  @override
     DateTime createdAt;
   
     @override
  
positive.code:         refreshToken: data['refresh_token'],
          scopes: data['scopes'],
          lifeSpan: data['life_span'],
          application: data['application'] == null
              ? null
              : (data['application'] is Application
                  ? data['application']
                  : new Application.fromJson(data['application'])),
          createdAt: data['created_at'] is DateTime
              ? data['created_at']
              : (data['created_at'] is String
  
negative.code:         'refresh_token': refreshToken,
          'scopes': scopes,
          'life_span': lifeSpan,
          'created_at': createdAt == null ? null : createdAt.toIso8601String(),
          'updated_at': updatedAt == null ? null : updatedAt.toIso8601String()
        };
  