REALLY basic idea to convert a submitted string value to an appropriate type (interface{}) to match a Puppet Type

puppetTypeParse.go

// getInterfaceValue will return an interface{} with an appropriate type for the puppetType
//  NOTE: This is *very* basic and will revert to just returning the string value by default.
func getInterfaceValue(puppetType string, val string) (retVal interface{}) {
	var err error
	if val == "" {
		return nil // Don't set a parameter that is "" (empty)
	}
	// Handle Optional[WHATEVER]
	if strings.HasPrefix(puppetType, "Optional[") {
		puppetType = strings.TrimPrefix(puppetType, "Optional[")
		puppetType = strings.TrimSuffix(puppetType, "]")
		return getInterfaceValue(puppetType, val)
	}
	if puppetType == "Integer" {
		retVal, err = strconv.Atoi(val)
		if err != nil {
			log.WithField("val", val).Error("Error converting to integer: ", err)
			return nil
		}
		return
	}
	if puppetType == "Boolean" {
		switch val {
		case "yes", "true", "1":
			return true
		default:
			return false
		}
	}
	// Otherwise just return the "string" (shrug)
	return val
}