Hi.
I've just release a package FixedDecimal on SqueakSource.
A FixedDecimal is similar to a ScaledDecimal, but different in certain select ways. It's primary purpose was to be able to represent precise decimals for such things as representing money - where ScaledDecimals leave something to be desired. For instance, with ScaledDecimals, you get: (33.333s withScale:2) + (33.333s withScale:2) print it yields 66.67s but with FixedDecimals, you would get: (33.333 asFixedDecimal: 2) + (33.333 asFixedDecimal: 2) print it yields 66.66. So, FixedDecimals round the numbers to the exact scale you specify - converting a float to a FixedDecimal and back will not necessarily return the starting number, unlike ScaledDecimals.
Most simple arithmetic is defined for FixedDecimals, but not all methods that probably should be (it's getting late and I'm going away for the weekend - thought I'd publish what I have).
Thanks, Chris