[technion]

I'm jaded enough to imagine that if I ask someone to define it better and try to give a "senior" response that covered codepoints, an interviewer will write down "struggled with simple question".

Edit: That seems consistent with a statement made in another response.

[Doxin]

I feel like the best way to tackle questions like these is to first jot down a simple solution and then point out the various ways it doesn't work.