I was just reading through http://scottraymond.net/articles/ 2006/02/28/rails-1.1, which gives an overview of the next Rails release. I noticed a number of extensions to the core ruby classes: Object#to_json Enumerable#group_by Array#in_groups_of Hash#to_xml Array#to_xml Object#extended_by and so on. Earlier versions of Rails also have lots of extensions to the core libraries. Is anyone else concerned that the rapid evolution and adoption of Rails is de facto forking the core and standard libraries of Ruby? I don't like the idea of having to know if I'm looking at Ruby on Rails or Ruby Classic. Gary Wright