code: function onData( addend ) {
  		/**
  		* FUNCTION: onData( newVal, encoding, clbk )
  		*	Data event handler. Performs addition.
  		*
  		* @private
  		* @param {Number} newVal - streamed data value
  		* @param {String} encoding
  		* @param {Function} clbk - callback to invoke after performing addition. Function accepts two arguments: [ error, chunk ].
  		*/
  		return function onData( newVal, encoding, clbk ) {
  			clbk( null, newVal+addend );
  		}; // end FUNCTION onData()
  	}
docs: FUNCTIONS // 
  FUNCTION: onData( addend )
  Returns a callback which performs addition.
  
  @private
  @param {Number} addend - value to add to streamed values
  @returns {Function} callback