Almost all of the test matrix is green with this PR. There is still one failure - ActiveRecord edge + Rubinius. This appears to be the result of a recently introduced incompatibility. I'm not sure how to fix it. But the remaining Rubinius specs all run as expected now.
Add Rubinius gems to Gemfiles. Update Rakefile to handle Rubinius/Rai…
…ls 4 case where RDocTask is not available.
@petergoldstein Wow! Awesome work! Thank you! ⚡️ ⚡️ ⚡️