ufv_save
========

.. py:function:: t3toolbox.backend.ufv_operations.ufv_save(file, data)

   .. code-block:: python

      def ufv_save(file, data) -> None:  # data: (*supercores, shape, masks) for a UT3Frame or UT3Variations


   Save a bv ``.data`` tuple to a ``.npz`` (3 families: the supercores, the rank masks, the ``shape``
   ints). Generic over the supercore count; mirrors :py:func:`ut3_constructors.ut3_save`. ``np.savez``
   keeps the boolean mask dtype, so :py:func:`ufv_load` recovers host bool masks.