typed.go
func JsonFile(path string) (Typed, error) {
	data, err := ioutil.ReadFile(path)
	if err != nil {
		return nil, err
	}
	return Json(data)
}
func JsonFile(path string) (Typed, error) {
	data, err := ioutil.ReadFile(path)
	if err != nil {
		return nil, err
	}
	return Json(data)
}
// Create a Typed helper from the JSON within a file