code: func (j *Json) MustBool(args ...bool) bool {
  	var def bool
  
  	switch len(args) {
  	case 0:
  	case 1:
  		def = args[0]
  	default:
  		log.Panicf("MustBool() received too many arguments %d", len(args))
  	}
  
  	b, err := j.Bool()
  	if err == nil {
  		return b
  	}
  
  	return def
  }
docs: // MustBool guarantees the return of a `bool` (with optional default)
  //
  // useful when you explicitly want a `bool` in a single value return context:
  //     myFunc(js.Get("param1").MustBool(), js.Get("optional_param").MustBool(true))