method_missing

# File activesupport/lib/active_support/ordered_options.rb, line 37
    def method_missing(name, *args)
      name_string = name.to_s
      if name_string.chomp!('=')
        self[name_string] = args.first
      else
        bangs = name_string.chomp!('!')

        if bangs
          fetch(name_string.to_sym).presence || raise(KeyError.new("#{name_string} is blank."))
        else
          self[name_string]
        end
      end
    end