From: rubyinfo <rubyinfo@...>
Date: 2013-01-13T05:03:41+09:00
Subject: uniq vs uniq!

1.8.7 :001 > [].uniq!
  => nil
1.8.7 :002 > [].uniq
  => []

1.9.3p194 :001 > [].uniq
  => []
1.9.3p194 :002 > [].uniq!
  => nil


Why ?

David