Revision history for Number-Object
0.03  2014-04-01 11:59:50 JST
        - modern way
        - japanese tax rate++ ;(
0.02    2007-06-08T19:37:00+09:00
        - add plugin ArithmeticOperation
        - add method of processing the decimal point of Tax plugin.
        - add POD to Tax plugin
0.01    2007-05-10T06:02:08+09:00
        - original version