# File lib/rbot/config.rb, line 254
    def handle_unset(m, params)
      key = params[:key].to_s.intern
      unless @@items.has_key?(key)
        m.reply "no such config key #{key}"
      end
      @@items[key].unset
      handle_get(m, params)
      m.reply "this config change will take effect on the next restart" if @@items[key].requires_restart
    end