This would've been the greatest solution ever if not the obscure function names

Per the Haskell Report, the Fractional class is for numbers that support real division, not integer (floor) division. While there's nothing enforcing this in the compiler, it goes against best practices.

Haskell translation

Author here. I completely forgot Fractional existed while writing the Haskell translation. Just change Division and (//) to Fractional and (/) and your solution should work again. Sorry about this.

Updating to GHC 9.2, no changes to code.

Updating to GHC 9.2, no changes to code.

No major changes for updating to GHC 9.2

Hi. I'm not sure to understand your question.

If you mean that you can add another parent to some child (and grand-...-child) of the root, and still pass the tests, that's right, that's not something I took account of when writing the tests.
The goal of the kata is to reproduce the family given in the description. If you can do that, and do other things too in the same time, I would say that's fair game.

If you are a beginner, please, be informed, that while these one-liners may look "cool", this is not what you want to do.

Nevermind

Can someone explain this?

Adding some more sample tests, and one that checks for correct pixel matching.

almost machine code

rejected by JohanWiltink.