def _xtra_params(refill, take, timestamp, strict):
    """
    Helper to supply add list with non default options to reduce
    command.
    """
    xtra_params = []
    if refill != 0:
        xtra_params.extend(("REFILL", refill))
    if take != 1:
        xtra_params.extend(("TAKE", take))
    if timestamp != 0:
        xtra_params.extend(("AT", timestamp))
    if strict:
        xtra_params.extend(("STRICT",))
    return xtra_params