Fixing compiler warnings

https://www.pivotaltracker.com/story/show/81290082
Yes, both questions are valid. Here are my responses:

- No, because I know of no clear mandate. (Maybe we do have a mandate and I just haven't heard, which is far from unlikely.) @eddies was keen on metrics. I now know of no other rationale.

- If we keep it, then the pattern will involve inheritable test frames that check both counting and timing results.