I mean, cool and all for "if you mutate your inputs you deserve what you get", but there's a Javascript version of this Kata and, well, that should kinda raise an eyebrow right there. A more explicit admonition in the instructions would've been helpful.

I'm curious why you'd purposely change the provided input variable names to make them less readable.

If only I earned honor points for that!
I figured this solution would make for a fun conversation when we meet.

This is clearly expertly constructed to give me an aneurysm.

Well, based on input var name alone this wins a prize.

The fact that this question even gets asked is an indication that this solution is less than ideal.