From: Jim Crossley <jim@...>
Date: 2009-11-14T23:50:05+09:00
Subject: Surprising behavior when extending instances

This surprised me:

  module English; def say; "yes"; end; end
  module French; def say; "oui"; end; end
  x = Object.new
  x.extend English
  x.say                 # "yes"
  x.extend French
  x.say                 # "oui"
  x.extend English
  x.say                 # "oui"

What wrong assumptions am I making that this surprises me?  What is
the more elegant "Ruby way" of alternating an object's behavior at
runtime?

Thanks,
Jim