frame_has_minimal_ranks
=======================

.. py:function:: t3toolbox.backend.ranks.frame_has_minimal_ranks(shape, up_ranks, down_ranks, left_ranks, right_ranks)

   .. code-block:: python

      def frame_has_minimal_ranks(
              shape:          typ.Sequence[int],
              up_ranks:       typ.Sequence[int],
              down_ranks:     typ.Sequence[int],
              left_ranks:     typ.Sequence[int],
              right_ranks:    typ.Sequence[int],
      ) -> bool:


   True if a T3Frame with these (redundant) ranks is structurally minimal.

   Requires the left/right and up/down rank stores to agree, and the up/left ranks to equal the
   minimal ranks for the shape.