anchor.diff:    String get authorizeUrl => _authorizeUrl;
     String get clientId => _clientId;
     String get clientSecret => _clientSecret;
  +  String get commentKind => _kind[kComment] ?? kCommentKind;
     String get httpProxy => _httpProxy;
     String get httpsProxy => _httpsProxy;
  +  String get messageKind => _kind[kMessage] ?? kMessage;
     String get oauthUrl => _oauthUrl;
     String get password => _password;
     String get redditUrl => _redditUrl;
  +  String get redditorKind => _kind[kRedditor] ?? kRedditor;
     String get redirectUrl => _redirectUrl;
     String get refreshToken => _refreshToken;
     String get revokeToken => _revokeToken;
  +  String get submissionKind => _kind[kSubmission] ?? kSubmissionKind;
  +  String get subredditKind => _kind[kSubreddit] ?? kSubredditKind;
     String get userAgent => _userAgent;
     String get username => _username;
   
  
positive.code:         case kAccessToken:
            _accessToken = value ?? kDefaultAccessToken;
            break;
          case kAuthorizeUrl:
            _authorizeUrl = value ?? kDefaultAuthorizeUrl;
            break;
          case kRevokeToken:
  
negative.code:       kUsername,
      ],
      kOptionalWithDefaultValues: const [
        kAuthorize,
        kAccessToken,
        kRevokeToken,
      ],
  