[Catalog-sig] PyPI mirrors are all up to date

["Martin v. Löwis"]

>> That mirroring implementation would violate the principle that
>> last-modified should only be updated when the mirroring run was
>> completed successfully.
> Is this documented anywhere? I don't see it in PEP381.

It's certainly meant by "the last synchronisation date the mirror
maintains". Should I qualify that with "successful synchronization"
to make it more clear?

Regards,
Martin