In #13112/#13326, I proposed to change the semantics of constructing structured dtypes with a shape-(1,) field (with a deprecation period).  Currently, a construct like `np.empty(1, ("a", int, 1))` is treated as a shape-() field, i.e. the same as `np.empty(1, ("a", int))`; the PR proposes to (ultimately) change it to mean using a shape-(1,) field, i.e. `np.empty(1, ("a", int, 1))`.  This is consistent e.g. with `np.empty(1, ("a", int, 2))` being equivalent to `np.empty(1, ("a", int, (2,)))` and more generally with numpy accepting a scalar integer n to mean shape-(n,) in many places (e.g. `np.zeros(3)` and `np.zeros((3,))`).

Thoughts?

Antony