def encode_nulls(data):
    """TOML does not support `None` so this function transforms to '@none '."""
    if data is None:
        return "@none "
    if isinstance(data, dict):
        return {key: encode_nulls(value) for key, value in data.items()}
    elif isinstance(data, (list, tuple)):
        return [encode_nulls(item) for item in data]
    return data
TOML does not support `None` so this function transforms to '@none '.
dynaconf/loaders/toml_loader.py