@classmethod
def _unpack_new(cls, raw, offset, t, length, prev):
    """
    Unpacks the body portion of this option type into a new object

    Override me.
    """
    o = cls()
    o._init()
    o.TYPE = t
    o.prev = prev
    o.raw = raw[offset:offset + length]
    return offset + length, o
