This package supports both conventional roman algarisms (which range from 1 to 3999) and milhar romans, a variation which uses a bar across the algarism to indicate multiplication by 1_000. for the purposes of this module, acceptable syntax consists of an underscore suffixed to the algarism e.g. iv_v = 4_005. the term milhar apparently derives from the portuguese word for "thousands" and the range of this notation extends the range of roman numbers to 3999 * 1000 + 3999 = 4_002_999.