Rails core - Oct 2008 - ActiveView::Helpers::InstanceTag

Hi lads!
I have a question about ActiveView::Helpers::InstanceTag

This class has method
    private
        def add_default_name_and_id(options)
          if options.has_key?("index")
            options["name"] ||=
tag_name_with_index(options["index"])
            options["id"]   ||=
tag_id_with_index(options["index"])
            options.delete("index")
          elsif defined?(@auto_index)
            options["name"] ||= tag_name_with_index(@auto_index)
            options["id"]   ||= tag_id_with_index(@auto_index)
          else
            options["name"] ||= tag_name + (options.has_key?
(''multiple'') ? ''[]'' : '''')
            options["id"]   ||= tag_id
          end
        end

May be i don''t know some thing, but how i can told  InstanceTag to
build tag name with ''index'' which i pass and
''multiple'' at once!?

I think that author  intend this code:
  private
      def add_default_name_and_id(options)
         if options.has_key?("index")
           options["name"] ||=
tag_name_with_index(options["index"])
           options["id"]   ||=
tag_id_with_index(options["index"])
           options.delete("index")
         elsif defined?(@auto_index)
           options["name"] ||= tag_name_with_index(@auto_index)
           options["id"]   ||= tag_id_with_index(@auto_index)
         else
           options["id"]   ||= tag_id
           options["name"] ||= tag_name
         end

         options["name"] += ''[]'' if
options.has_key?(''multiple'')
      end


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