[Python-Dev] Hashing proposal: change only string-only dicts

["Martin v. Löwis"]

> +1 Absolutely.  We can and should make 3.3 change hashes across runs
> (behavior that can be disabled via a flag or environment variable).
> 
> I think the issue of doctests and such breaking even in 2.7 due to hash
> order changes is a being overblown.  Code like that has already needs to
> fix its tests at least once when they want tests to pass on on both
> 32-bit and 64-bit python VMs (they have different hashes).  Do we have
> _any_ measure of how big a deal this will be before going too far here?

My concern is not about breaking doctests: this proposal will also break
them. My concern is about applications that assume that hash(s) is
stable across runs, and we do have reports that it will break
applications.

Regards,
Martin