Thinking over my programming career, there were a few occasions I had to spend time working around floating point errors, and it was a nuisance. There were even fewer times when I worked with transcendental numbers- programs dealing with geometry or tones or logarithmic scales- and those times, floating point was good enough.

Which is to say, Perl 6's Rats would have solved my nuisance issues, and I would not have appreciated exact types for irrational numbers in my tasks to date. Still, I couldn't resist thinking about them and web-searching on them a bit more, and here's my brain-dump. Periodic continued fractions <https://en.wikipedia.org/wiki/Continued_fraction> can represent any quadratic root <http://www.millersville.edu/~bikenaga/number-theory/periodic-continued-fractions/periodic-continued-fractions.html>. Haskel has this package implementing a quadratic irrational type <https://hackage.haskell.org/package/quadratic-irrational-0.0.2/docs/Numeric-QuadraticIrrational.html>, and it can translate between those and continued fractions. ... here is a decent intro to continued fractions <http://www.maths.surrey.ac.uk/hosted-sites/R.Knott/Fibonacci/cfINTRO.html>. That's a comprehensive answer for square roots of rationals, but not for transcendental numbers <http://sprott.physics.wisc.edu/pickover/trans.html>. My math is not so hot, but perhaps a generalized continued fraction <https://en.wikipedia.org/wiki/Generalized_continued_fraction> type could perfectly represent transcendental constants like pi and e, with trig and log/exponentiation functions using them. Then Perl 6 could get this famous relationship *exactly right*: say 1 + e ** (pi * i) ... though I suspect it really does take a symbolic math package to get all combinations of the trig & exponential functions right <https://cloud.sagemath.com/projects/3966ff36-7109-449d-83a9-49e48e078fea/files/2015-06-22-133206.sagews> . -y