[issue15814] memoryview: equality-hash invariant

[Martin v. Löwis]

Martin v. Löwis added the comment:

Am 01.09.12 16:24, schrieb Stefan Krah:
> Does "byte arrays" include 'b' and 'c' or just 'B'? I don't see a reason
> to allow 'B' but not the others.

Either type is fine with me. It's the multi-dimensional aspect I'd like
to ban.

> My reasoning was: If non-contiguous arrays are allowed (and I think they
> should be), why not allow multi-dimensional arrays, too?

I think neither should be allowed. The explicit request (from Antoine)
was that memoryviews of bytes objects should be hashable. I haven't
heard anybody asking for something more general (but I could see that
people want to hash other memory blocks as well, such as mmap views).

I can see that it is tempting to provide the most general definition,
but see where this approach got us. It's always easier to widen an
interface later than to narrow it.

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