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http://redmine.ruby-lang.org/issues/show/2674
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http://redmine.ruby-lang.org/issues/show/2033
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http://redmine.ruby-lang.org/issues/show/2190
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http://redmine.ruby-lang.org/issues/show/2255
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http://redmine.ruby-lang.org/issues/show/2454
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http://redmine.ruby-lang.org/issues/show/2674
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