code: function goGet(api, key, requestor, params) {
    /*jshint validthis: true */
  
    var query  = {};
    var opt;
  
    // extract query options
    for (opt in this.options) {
      query[opt] = this.options[opt];
    }
  
    // unexpected params are ignored,
    // so we don't need to filter the query options from the params object
    var opts   = api.request(key, params, query);
    var duplex = requestor.newDuplex(opts);
  
    return duplex;
  }
docs: /*
  
  Private Functions
  
   bound method that accepts a `params` object and returns a duplex stream