docs: function(keys, options) {
        if (isArray(keys)) keys = keys.join(',');
        else if (isObject(keys)) {
          options = keys;
          keys = null;
        }
  
        options = opts(this, options);
        var query = keys ? server_params(options, {keys: keys}) : null;
        return new APICall({
          action: 'text',
          type: 'GET',
          options: options,
          query: query
        });
      }