In regular programming, zero is false and anything else is true.

In ZK cryptography, zero is true and anything else is false.

Hmm. Isn’t this also the case in Hoon, the urbit language? Though iirc that was just an arbitrary design flex with no reasoning behind it.

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It is, they call it a "loobean" instead of a "boolean."

I'm eth newbie..just learning
(working on @farcaster)

terminally.online

and iirc its not arbitrary, but a nod to linux exit codes and also an intentional hurdle to keep "normie" devs away

Nice. I didn't know this word.
https://developers.urbit.org/reference/glossary/loobean 
It is also the convention for the return code of a correct program execution.
And so it is for me THE good convention in shell scripts (sh, bash, etc.)