Should be fixed in TS.

in ts same problem..

It definitely happens in ruby (too): see this or this...

cool

I don't doubt you are correct, but I did this more than a few braincells ago and can no longer read the description or my solution.

I'd suggest suggesting a new fixed test to the kata author ( because this might happen in other languages as well ).

I updated the generation of the random string. Hopefully this shouldn't happen anymore.

why not set the upper limit to 10^9 instead of 10^6?

Because changing the requirements of an approved kata is not good.

Ok. I have increased the acceptable error for the random tests

Thanks for this link

there's https://github.com/Codewars/codewars.com/wiki/List-of-Possible-Duplicate-Kata

They both are approved, how to solve this issue now?

Fixed

No, it is not abuse of logic: fix (S . (* Z)) should have 1 === S Z as fixpoint, because
S . (* Z) $ S Z = S Z (1 + 1 * 0 = 1); and your definition successfully yields it for fix (S . (Z *)) = S Z.