code: function next( idx ) {
  		/**
  		* FUNCTION: next( error, data )
  		*	Callback invoked upon completing a request.
  		*
  		* @private
  		* @param {Error|Null} error - error object
  		* @param {String} data - response data
  		* @returns {Void}
  		*/
  		return function next( error, data ) {
  			if ( eFLG ) {
  				return;
  			}
  			if ( error ) {
  				if ( error.status !== 404 ) {
  					eFLG = true;
  					return done( error );
  				}
  				data = error;
  			}
  			data = normalize( chunks[ idx ], data );
  			data = transform( chunks[ idx ], data );
  
  			out[ idx ] = data;
  
  			done();
  		}; // end FUNCTION next()
  	}
docs: FUNCTION: next( idx )
  Returns a callback to be invoked upon completing a request.
  
  @private
  @param {Number} idx - chunk index
  @returns {Function} callback