Could you post your incorrect code with a spoiler flag please? I've just controlled JS tests and I'm surprised an incorrect solution could pass, I'd like to see where is failing your code, in order to suggest improvements and take it in account in a new translation I am preparing.

true I literally can passed the kata using the same code and adding 1 line just to solve that expecific sample test, very unsatisfactory.
I'll have to keep trying to solve it without that trick

The basic test you are refering to expects 123. It's a problem with your code, though if your code fails only on this one it also means tests should be enhanced with adding some similar random tests (which means your code should not pass all the other tests if they were complete).

for some reason it says I passed all tests except the basic one, which returns 'net' instead of '123' :<
is it a problem in my code or a bug?

thanks :D