code: func (args Arguments) Int(index int) int {
  	var s int
  	var ok bool
  	if s, ok = args.Get(index).(int); !ok {
  		panic(fmt.Sprintf("assert: arguments: Int(%d) failed because object wasn't correct type: %v", index, args.Get(index)))
  	}
  	return s
  }
docs: // Int gets the argument at the specified index. Panics if there is no argument, or
  // if the argument is of the wrong type.