the lurking answer to gemfile.lock's existence
i’m not at all a ruby user so this is being stored away for future reference. of particular note, pay attention to the “checking your code into version control” section … specifically regarding the gemfile.lock and what to do … This is important: the Gemfile.lock makes your application a single package of both your own code and the third-party code it ran the last time you know for sure that everything worked....