code: function forwardEvent (event) {
      var n = Atok.events[event]
        , args = []
  
      while (n > 0) args.push('a' + n--)
      args = args.join()
  
      return 'atok.on("'
        + event
        + '", function forwardEvent (' + args + ') { self.emit_' + event + '(' + args + ') })'
    }
docs: Set an event arguments list