anchor.diff:      method = cfg.encryptionMethod;
       mode = cfg.mode;
       user = "nobody";
  -    fast_open = true;
  -  } // optionalAttrs (cfg.password != null) { password = cfg.password; };
  +    fast_open = cfg.fastOpen;
  +  } // optionalAttrs (cfg.plugin != null) {
  +    plugin = cfg.plugin;
  +    plugin_opts = cfg.pluginOpts;
  +  } // optionalAttrs (cfg.password != null) {
  +    password = cfg.password;
  +  };
   
     configFile = pkgs.writeText "shadowsocks.json" (builtins.toJSON opts);
   
  
positive.code:         '';
        };
  
        encryptionMethod = mkOption {
          type = types.str;
          default = "chacha20-ietf-poly1305";
  
negative.code:         '';
        };
  
        plugin = mkOption {
          type = types.nullOr types.str;
          default = null;
          example = "\${pkgs.shadowsocks-v2ray-plugin}/bin/v2ray-plugin";
          description = ''
            SIP003 plugin for shadowsocks
          '';
        };
  
        pluginOpts = mkOption {
          type = types.str;
          default = "";
          example = "server;host=example.com";
          description = ''
            Options to pass to the plugin if one was specified
          '';
        };
      };
  
    };
  