It's always surprising how often interviewers fall back on "API Jeopardy" when trying to make hiring decisions. Maybe it's just because my career hasn't really allowed the luxury of getting deep on any technical stack and staying there, but I just don't keep the details of obscure function calls in my head all the time. And I have to wonder at the utility of testing a developer on having memorized the kinds of things that they will always, ALWAYS be able to look up when they're actually working.