    # File lib/rbot/core/config.rb, line 85
      def handle_unset(m, params)
        key = params[:key].to_s.intern
        unless @bot.config.items.has_key?(key)
          m.reply _("no such config key %{key}") % {:key => key}
        end
        return if !@bot.auth.allow?(@bot.config.items[key].auth_path, m.source, m.replyto)
        @bot.config.items[key].unset
        handle_get(m, params)
        m.reply _("this config change will take effect on the next restart") if @bot.config.items[key].requires_restart
        m.reply _("this config change will take effect on the next rescan") if @bot.config.items[key].requires_rescan
      end