# File lib/hashie/clash.rb, line 87
    def respond_to_missing?(method_name, _include_private = false)
      method_name = method_name.to_s

      if method_name.end_with?('!')
        key = method_name[0...-1].to_sym
        [NilClass, Clash, Hash].include?(self[key].class)
      else
        true
      end
    end