If a leaderboard contains no runs, how should the get_rank_time() method behave? Should it throw an error or return positive infinity?

Similarly, what about when the rank passed is larger than the number of runs in the leaderboard?

with returning positive infinity, thats what im also doing for now. and for what its worth, to cover all edge cases, im throwing negative infinity for when the rank is < 1. I am sort of just assuming that that is what we are expected to do, but ill be keeping an eye on this forum for any updates because it does feel a bit iffy.