I'd disagree with the upgrade from 2.3 to 2.4: > Though ISO/IEC 30170:2012 doesn’t specify details of the Integer class, Ruby had two visible Integer classes:

I'd disagree with the upgrade from 2.3 to 2.4: > Though ISO/IEC 30170:2012 doesn’t specify details of the Integer class, Ruby had two visible Integer classes: Fixnum and Bignum. Ruby 2.4 unifies them into Integer. All C extensions which touch the Fixnum or Bignum class need to be fixed. https://www.ruby-lang.org/en/news/2016/12/25/ruby-2-4-0-released/ https://www.ruby-lang.org/en/news/2016/12/25/ruby-2-4-0-rele...