Me: *spends 5 hours screwing around with recursion and performing operations in reverse order*
Unit tests: *pass*
Me: Wow. Okay, that’s interesting.
*run tests again*
Me: Right, well, that’s just dandy. Now, how did I get here and how do I document this...

TL;DR I spent 5 hours fucking about and accidentally came up with a working solution that I can’t explain

EDIT: RIP wrong category