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this class won't stop you.

* Perl is liable to produce tiny math errors, like just about any
other language that does its math in binary but has to convert to and
from decimal for purposes of human interaction.  I've seen this
surface as tiny discrepancies in loan calculations -- "tiny" as in
less than $1 for even multi-million-dollar loans amortized over
decades.

* Moreover, oddities may creep in because of round-off errors. This
seems to result from the fact that the formula that takes term,
interest rate, and principal, and returns the monthly payment, doesn't
know that a real-world monthly payment of "$1020.309" is impossible --
and so that ninth of a cent difference can add up across the months.
At worst, this may cause a 30-year-loan loan coming to term in 30
years and 1 month, with the last payment being needed to pay off a
balance of two dollars, or the like.

These errors have never been a problem for any purpose I've
put this class to, but be on the look out.