I had just noticed yesterday that Heroku was using bundler 1.2.0.pre when I pushed changes to an app. I was surprised because 1.1 came out just a few months ago. I guess this explains why.<p>Wasn't it also previously possible to specify your ruby version on heroku with a configuration variable? I've never done so but I seem to recall seeing it in a tutorial or some application's setup procedure.
Very interesting. Since bundler's Gemfile is involved in specifying the version, does this mean that bundler itself is going to be jumping into the world of Ruby version management in 1.2, or is it just acting as a dumb conduit to make the desired version number available as metadata for another tool to act on?