anchor.diff:  
         srpKeyExchange = mkOption {
           default = false;
  +        type = types.bool;
           description = ''
             Whether to enable SRP key exchange and user authentication.
           '';
  
positive.code: 
        interfaces = mkOption {
          default = [];
          description = ''
            List of network interfaces where listening for connections.
            When providing the empty list, `[]', lshd listens on all
  
negative.code: 
        portNumber = mkOption {
          default = 22;
          type = types.port;
          description = ''
            The port on which to listen for connections.
          '';
  