> General support for strides in cast(), i.e. a zero-copy view for
> non-contiguous arrays does not seem possible because buf.ptr is
> moved around. Even NumPy does not support that:

I'd be happy enough with zero-copy `cast()` of f-continguous arrays
along with the parameter `shape`, as this makes interfacing with
orginally-in-FORTRAN C libraries through ctypes or cffi possible
(without having to write a C-extension).