@classmethod
def transcribe_value(cls, value, **kw):
    """ For simple `PacketField`s, return a bytes transcription of a
        value suitable for the `.value` attribute.

        For example, the `BSUInt` subclass stores a `int` as its
        `.value` and exposes its serialisation method, suitable for
        any `int`, as `transcribe_value`.
    """
    return cls(value, **kw).transcribe()
