method_missing

# File activesupport/lib/active_support/ordered_options.rb, line 49
    def method_missing(method, *args)
      if method.end_with?("=")
        self[method.name.chomp("=")] = args.first
      elsif method.end_with?("!")
        name_string = method.name.chomp("!")
        self[name_string].presence || raise(KeyError.new(":#{name_string} is blank"))
      else
        self[method.name]
      end
    end