Permutation specifying the element storage order within the innermost chunks.

If the inner order is specified as a soft constraint rather than a hard constraint, inner_order is equal to None and the soft constraint is accessed via inner_order_soft_constraint.

Lexicographic order (i.e. C order/row-major order) is specified as [0, 1, ..., rank-1], while colexicographic order (i.e. Fortran order/column-major order) is specified as [rank-1, ..., 1, 0].