A thing that I noticed in this post: some changes relate to "improper usage". Yes, Array#to_s did perform a join, but it was never the method intended to do a j

A thing that I noticed in this post: some changes relate to "improper usage". Yes, Array#to_s did perform a join, but it was never the method intended to do a join - thats #join. This should never be done in the first place. Use the tools that are meant for the job, even if the other is more convenient (although I never understood this specific case, I always used #join). It will bite you if you don't. Another example was using #map without block as a #to_a alternative (which now returns an Enumerator). Also, it shows that a lot of naming problems were actually corrected in the transition to 1.9, like the #type<>#class thing. Less is better and I am grateful that the core team actually made some cuts. In the end, my personal experience is that upgrading to 1.9 is not that much pain as many say. Sure, for large projects, the work is substantial as an absolute value, but this sounded quite manageable. Sadly, their blogpost on their migration to Rails 3 doesn't mention any numbers in that regard: http://www.getharvest.com/blog/2011/01/harvest-is-running-rails-3/ http://www.getharvest.com/blog/2011/01/harvest-is-running-ra...