code: function setup(spark) {
      spark.streams = {};
  
      Object.keys(spark.reserved.events).filter(function filter(event) {
        return 'data' !== event;
      }).forEach(function each(event) {
        spark.on(event, listen(event, spark));
      });
    }
docs: Setup the Primus instance so we can start creating substreams.
  
  @param {Spark} spark Incoming connection
  @api private