Looks good now. Tough kata ;)

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Fixed.

Glad to hear that! Then the kata definitely achieved its goal. Thanks for creating it—it was a fun one to reason through.

Thanks, that is the exact purpose of kata's tagged as puzzle, part of the job is figuring out specs along the way.

I removed the big check in favor of a less intrusive one, should I still add it to the description or is it less likely to generate adversarial solutions if I just don't mantion it?

( Python, possibly others )

Restrictions should be specified in the description.

Yes, definitely 😄 For me, a good kata isn't necessarily the one that takes the longest to code, but the one that makes you stop and think carefully before you start coding. That's what I enjoyed about this one.

Is that really a compliment?

This was one of those katas where I spent more time understanding the rules than writing the code, and I mean that as a compliment. Once the behavior clicked, the problem became really satisfying to think about. Thanks for creating something that rewards careful reading instead of rushing in.

There's a simpler way

approved

Python: the function should return a tuple.

Fix with backward compatibility

This makes no sense