def roundk(value: float | int, digits: int | None = None) -> float | int:
    if not isinstance(value, (float, int)):
        raise NotImplementedError("Only float is implemented")

    def iceil():
        return (value // 10 + 1) * 10

    def ifloor():
        return (value // 10) * 10

    def do_iceil():
        return (value % 10) >= 5

    return_type = int if digits is None or isinstance(value, int) else float
    digits = digits or 0

    to_int = 10 ** (digits + 1)
    to_float = 10 ** (-digits - 1)
    value = int(value * to_int)

    if do_iceil():
        return return_type(iceil() * to_float)
    else:
        return return_type(ifloor() * to_float)


roundk(155.4, -1)