# File lib/mechanize/form.rb, line 260
      def set_fields(fields = {})
        fields.each do |k,v|
          value = nil
          index = 0
          v.each do |val|
            index = val.to_i unless value.nil?
            value = val if value.nil?
          end
          self.fields.name(k.to_s).[](index).value = value
        end
      end