The point is that it's not sufficient to run the current 20k tests against head daily; there are so many unplanned variations and 'emergent' design that there's

The point is that it's not sufficient to run the current 20k tests against head daily; there are so many unplanned variations and 'emergent' design that there's a full time job just in keeping up with the changes to MRI ruby. And even if there wasn't, @brixen has repeatedly pointed out how the MRI authors have chosen to ignore the RubySpec project entirely. That's really sad.