Mathn Rational#power2

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http://redmine.ruby-lang.org/issues/show/175

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In [ruby-dev :35189 ] the message: "[ruby-dev:35189] mathn
Rational#power2 ", on Jun/21 05:17(JST) Yukihiro M. writes:

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http://redmine.ruby-lang.org/issues/show/175

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