https://www.python.org/dev/peps/pep-0632/#migration-advice https://github.com/hugapi/hug/blob/8b5ac00632543addfdcecc326d0475a685a0cba7/hug/types.py#L26 https://github.com/hugapi/hug/blob/8b5ac00632543addfdcecc326d0475a685a0cba7/hug/api.py#L27
