Another very interesting (and well-thought) article on the topic is Tony Arcieri's latest blog post: http://tonyarcieri.com/an-open-letter-to-matz-on-ruby-type-

Another very interesting (and well-thought) article on the topic is Tony Arcieri's latest blog post: http://tonyarcieri.com/an-open-letter-to-matz-on-ruby-type-systems http://tonyarcieri.com/an-open-letter-to-matz-on-ruby-type-s.... I can't wait to see how this develops, the simple fact that people inside the Ruby community are willing to put all this on the table is a good sign about the dynamism of all involved.