Issue #2043 has been updated by Vit Ondruch.
Thank you for the links. It was interesting.
I'm looking forward Ruby 2.0 and their automatic conversions, since writing c = a.encode('utf-8') + b.encode('utf-8') to safely concatenate two strings is not sexy at all.
Vit
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http://redmine.ruby-lang.org/issues/show/2043
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http://redmine.ruby-lang.org