> const f = (x) => [x/2, x/0]
    undefined
    > f(10)
    [ 5, Infinity ]

Go solves this really badly.

As for specifically what to do about division: the right default depends on your application. Either way is defensible, and I would rather work on making it easy to pick either style in the language of your choice, than to worry too much about what the default should be.

You can have one or the other.

You can't have both without the risk of nasal demons. Unless the result of the operation is business-safe to throw away.

That's why having the default / have both is an poor design choice by gleam and pony. Someone will reach for / and encounter demons. Afaict the other langs that do this are not intended for real world prod use. By default / should force the developer into either crashable or unwrap error return. If you want some sort of opt-in "logic-unsafe /", fine but call it something else like </> e.g.

Some people get scarred working in other langs and can't let go, I guess?

https://en.wikipedia.org/wiki/Projectively_extended_real_lin...