An alternative which is used in C a lot is to make them into integers by multiplying everything by 10**N where N is the number of decimal places (or precision) you want to have in your answer. Then, when you're done, you divide the answer by 10**N and you're good.
*ponders* This sounds like a good candidate for a CPAN module doing overloaded math ... Or, you could just use Math::BigFloat (which may be overkill)
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