You're hitting the recursion limit.

What language are you using?

I've also removed all fixed tests that expected negative values. This should be done for JS and Python as well.

I'll update the Haskell version then.

That's still JSfuck, just with a bit of post-optimization.

When I say original I mean katas like these two:
https://www.codewars.com/kata/multi-line-task-plus-plus-hello-world
https://www.codewars.com/kata/multi-line-task-hello-world

Come on, another JSfuck kata again?

I'd expect something more creative and original than this.

Meh. I'd like to like it, but it comes down to JSFuck, and that's been done. Or what I did, but that's not really in correct spirit. I just don't know how this could be made to be really interesting.

Mmmm, until I see different solutions I'd say you reduced it to just a very few ways of solving it. It's becoming similar to this kata: https://www.codewars.com/kata/oh-come-on-hello-world-once-again (that one is less restrictive)

Not enough information.

It's fast, but also very memory-hungry... and there are a lot of different ways to implement it, not just one or two.

You'll have to post your code here and mark it as spoiler for us to have a look. If you took your solution from Voile's kata, there's quite a few changes needed to make it work with fractions and negative numbers.

Neither. Check the tags ;-)