# File lib/map.rb, line 619
  def method_missing(*args, &block)
    method = args.first.to_s
    case method
      when /=$/
        key = args.shift.to_s.chomp('=')
        value = args.shift
        self[key] = value
      when /\?$/
        key = args.shift.to_s.chomp('?')
        self.has?( key )
      else
        key = method
        unless has_key?(key)
          return(block ? fetch(key, &block) : super(*args))
        end
        self[key]
    end
  end