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encoding is a string. based on the patch by Hiroshi Moriyama at [ruby-dev:36811]. * test/iconv/test_basic.rb (test_invalid_arguments): added tests. git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@19866 b2dd03c8-39d4-4d8f-98ff-823fe69b080e