On 28 July 2016 at 16:34, Igor Neyman <ineyman(at)perceptron(dot)com> wrote:
> Which means that you can make use of some new feature, but definitely not
> all.
> That makes "downgrade" feature very, very limited, if useful at all.
>
Sufficient to allow you to run the upgrade, find that there's a
catastrophic bug in the new version that causes your live system to fall
over but
which
didn't appear on your test system, and then revert to a working version?
I'd say that's a fairly useful feature, limited or not.
Geoff