readonly_mask_copies
====================

.. py:function:: t3toolbox.backend.common.readonly_mask_copies(masks)

   .. code-block:: python

      def readonly_mask_copies(masks):


   Defensive READ-ONLY numpy copies of a mask tuple, for storage in value-hashed aux objects:
   an aliased writeable caller array mutated in place would leave a stale cached jit key
   (review H1-5; the ``_weight_matrix`` precedent).