Here's an example where a web developer may find bit=fiddling useful: - How would you, compactly and discretely, represent in a cookie the days on which a user

Here's an example where a web developer may find bit=fiddling useful: - How would you, compactly and discretely, represent in a cookie the days on which a user has visited your site this month? (I am decided not a web developer, but this is a question I'd ask a web developer on a phone screen were I to hire one).