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When reading the title, the first thing that struck me too was division by zero.

I doubt this is a common misunderstanding among any but the most junior of devs.

I chose divide-by-zero because it is super easy for everybody to understand.

But that is not important. In a real application it might be a unicode error, a date error, a wrong-format error or something else.

In a language with errors as values, 100% code coverage (and no `unwrap()`) would force you to handle all the types of errors you mention.