[Numpy-discussion] isfortran compatibility in numpy 1.10.

[Charles R Harris]

Hi All,

The isfortran function calls a.fnc (Fortran-Not-C), which is implemented
as  F_CONTIGUOUS &&  !C_CONTIGUOUS. Before relaxed stride checking
contiguous multidimensional arrays could not be both and continguous 1-D
arrays were always CONTIGUOUS, but this is not longer the case.
Consequently current isfortran breaks backward compatiblity. There are two
suggested solutions

   1. Return `a.flags.f_contiguous`. This differs for 1-D arrays, but is
   most consistent with the name isfortran.
   2. Return `a.flags.f_contiguous and a.ndim > 1`, which would be backward
   compatible.

It is also possible to start with 2. but add a FutureWarning and later move
to 1, which it my preferred solution. See gh-6590
<https://github.com/numpy/numpy/issues/6590> for the issue.

Thoughts?
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