- Removed kluge code from #copy after figuring out the reason #dup was emptying   the receiver.
- Removed kluge code from #copy after figuring out the reason #dup was emptying
  the receiver.

- Changed calls to PolymorphicObject#become to reflect its name change.

--HG--
extra : convert_revision : svn%3A39a105f4-52d6-0310-bb1b-d6517044f2e4/trunk%40799

ged/mues