def __init__(self, header, reason=None):
        self.header = header
        self.reason = reason

    # DESTROY_NONE should always be sent forward to avoid leaking version
:param :class:`~oppy.cell.fixedlen.FixedLenCell.Header` header:
dataset/ETHPy150Open nskinkel/oppy/oppy/cell/fixedlen.py/DestroyCell.__init__