I'm running into this same issue.

First off, thanks for putting this together, it's been a fun challenge. However, I seem to be running into an issue with my attempt. The first attempt, I passed all tests but the performance test. My second attempt, after some minor code cleanup, is now failing all of the "anti cheating" "edge case" tests, but I haven't functionally changed anything.

Any idea what the issue could be? I put a good amount of effort into my solution, so it's a bit frustrating to fail in a way that I cannot identify.