I'm not sure what the purpose of this module is. All it does is turn basic math operators into confusingly named methods, but somehow this is supposed to be better for currency?
For example (from the docs):
my $money = Money(1.23);
$money = $money->_sub(1.22);
$money = $money - 1.22; # the same
edit: I guess DR:: is his personal namespace, so it should be thought of as Acme:: and pointlessly ok?