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由 David Heinemeier Hansson 提交于
Fixed validates_numericality_of to work with overrided getter-method when :allow_nil is on #1316 [raidel@onemail.at] git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@1603 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
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