# File lib/hashie/mash.rb, line 200
    def method_missing(method_name, *args, &blk)
      return self.[](method_name, &blk) if key?(method_name)
      suffixes_regex = ALLOWED_SUFFIXES.join
      match = method_name.to_s.match(/(.*?)([#{suffixes_regex}]?)$/)
      case match[2]
      when '='
        self[match[1]] = args.first
      when '?'
        !!self[match[1]]
      when '!'
        initializing_reader(match[1])
      when '_'
        underbang_reader(match[1])
      else
        default(method_name)
      end
    end