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/usr/lib/ruby/vendor_ruby/active_support/core_ext/string/encoding.rb is in ruby-activesupport-3.2 3.2.16-2.

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class String
  if defined?(Encoding) && "".respond_to?(:encode)
    def encoding_aware?
      true
    end
  else
    def encoding_aware?
      false
    end
  end
end