I'm the student that's writing the test suite. I addressed those issues in my proposal, but that part isn't public, so I'll explain how I plan to get it correct.

TimToady addressed the TODO issue rather well. I'm going to try as many implementations as feasible, but some will fail. For those, I'll refer to the spec as much as possible. If the spec is unclear, I'll ask on #perl6 and perl6-language. Peer review is another source of ensuring that the tests are correct.