The comprehensive test suite is foolish :)

One of the holes I'm doing well in is purely because the codegolf testsuite doesn't cover an edge case (which I saved one or two to avoid).

If you see an entry with a huge number of fails, I think you can assume they've been repeatedly submitting the same, failing solution until it passes on some random test allocation.

This was terrifically interesting, Andrew, thanks!

edit: of course you'd already noticed all this! Why am I not surprised