code: func OptServerTranslateFileMapSize(mapSize int) ServerOption {
  	return func(s *Server) error {
  		s.holder.translateFile = NewTranslateFile(OptTranslateFileMapSize(mapSize))
  		return nil
  	}
  }
docs: // OptServerTranslateFileMapSize is a functional option on Server
  // used to specify the size of the translate file.