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由 Jeremy Kemper 提交于
Treat validates_size_of :within as a single validator rather than splitting it into to ends of the range, thus yield two error messages on nil (yuck) git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@2355 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
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