In complex system measurement sometimes go beyond a simple sum of value, Nabiro introduced in the 0.9016 release a simple support for

	* Unit
        * Quantity
        * ConversionRatio
		

The Unit class is used to define strongly typed unit in the system, the Quantity class is a way you can represents quantity in complex systems that use strongly typed Unit, the ConversionRatio? class is a simple conversion system, in order to handle complex conversion like Celsius to Fahrenheit you can override the converter method of the class.

Simple usage

        dollar = new Dollar();
	dollar.symbol = "$";
	dollar.value = 1;
								
	var bc:BasketCost = new BasketCost();
				
	bc.amount = 5;
	bc.unit = dollar;
				
	var vect:Vector.<Unit> = new Vector.<Unit>();
	vect[0] = dollar;
	vect[1] = dollar;
	vect[2] = dollar;
	vect[3] = dollar;
				
	bc.sum(vect);
				
	trace(bc.toString())
				
	feet = new Feet();
				
	feet.symbol = "ft";
	feet.value = 1;
				
	var ch:CanvasHeight = new CanvasHeight();
				
	ch.unit = feet;
	ch.amount = 10;
				
	trace(ch.toString());
				
	var cr:ConversionRatio = new ConversionRatio(12);
	trace(cr.convertTo(ch))

Attached files contain the full example.