def add_default(name, **kwargs):
    """Add validator to the plugin class default meta.

    Validator is added to all subclasses by default

    :param name: str, full name of the validator plugin
    :param kwargs: dict, validator plugin arguments
    """

    def wrapper(plugin):
        plugin._default_meta_setdefault("validators", [])
        plugin._default_meta_get("validators").append((name, (), kwargs,))
        return plugin
    return wrapper