- Changed #become method to #polymorph to avoid collision with Ruby's new   Object#become. This was the source of the #dup mystery.
- Changed #become method to #polymorph to avoid collision with Ruby's new
  Object#become. This was the source of the #dup mystery.

--HG--
extra : convert_revision : svn%3A39a105f4-52d6-0310-bb1b-d6517044f2e4/trunk%40801

ged/mues