[robben1234]

>That said, I admit that I would also expect error handling to be addressed in any piece of software written for any purpose.

I always view assignments and live coding in interviews as a startup that has runway of an hour or two. Would error handling help this startup survive another day? No. But properly covering the main use case - may in fact be.

It's fair to want the candidate to mention the edge cases and tests for it in the end verbally, there I agree. But expecting 120% performance giving out vaguely formulated problems with extreme time constraints and the pressure of an interview to me seems almost delusional.