code: function deliverResponse(res) {
    var err = false;
    var result = null;
  
    if (this.active && 'id' in res && res['id'] in this.outTimers) {
      clearTimeout(this.outTimers[res['id']]);  // Passing true instead of a timeout is safe
      delete this.outTimers[res['id']];
    } else {
      // Silently ignoring second response to same request
      return;
    }
  
    if (res['id'] in this.inbox) {
      if ('error' in res) {
        err = res['error'];
      } else {
        result = res['result'];
      }
      setImmediate(this.inbox[res['id']], err, result);
      delete this.inbox[res['id']];
    }
    // Silently ignore timeout duplicate and malformed responses
  }
docs: Callback invoked when remote results are ready
  
  @callback JRPC~receiveCallback
  
  @param {boolean} err    True if the result is an error or unavailable
  @param {Object}  result The result from the remote method
  
  @return {undefined} No return value
   
  Deliver a received result
  
  @param {Object}  res     The single result to parse
  
  @return {undefined} No return value