For an updated list of bugs, see https://rt.cpan.org/Public/Dist/Display.html?Name=Math-BigRat The following list is not up to date: * BigRat does not handle modify() yet or in a very incomplete manner * There are probably many... rats. Some things are not yet implemented, or only implemented half-way: * inf handling (partial) * NaN handling (partial) * rounding (not implemented except for bceil/bfloor) * $x ** $y where $y is not an integer * bmod(), blog(), bmodinv() and bmodpow() (partial) Please send me test-reports, your experiences with this and your ideas - I love to hear about my work! Tels