reencode.rb

      def reencode_session(data)
        if data.is_a? Hash
          result = {}
          data.map do |key,val|
            if val.is_a?(Hash) || val.is_a?(Array)
              result[key] = reencode_session(val)
            else
              result[key] = ensure_utf8(val)
            end
          end
          result
        elsif data.is_a? Array
          data.map do |val|
            if val.is_a?(Hash) || val.is_a?(Array)
              reencode_session(val)
            else
              ensure_utf8(val)
            end
          end
        end
      end

      def ensure_utf8(val)
        if val.nil?
          nil
        else
          if val.respond_to?(:encoding) && val.respond_to?(:encode)
            val.encoding != ::Encoding::UTF_8 ? val.encode(::Encoding::UTF_8) : val
          else
            val
          end
        end
      end