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puzzled: debian 9.8 already?


apt-get just gave me this warning:
N: Il repository "http://cdn-fastly.deb.debian.org/debian stretch Release" ha modificato il valore "Version" da "9.7" a "9.8"
(In Italian, that is "value for version changed from 9.7 to 9.8")

Given that 9.7 was just released (I checked the website), is it just part of a normal preparation for the next point release or what else?
I have a mixed stable / testing setup.