Hello
> It is not, never has been, and never will be supported to try to run
> a cluster with an older server version after it's been modified by
> a newer one. We have enough trouble ensuring forwards compatibility.
I agree and believe that we document this compatibility policy somewhere. But I found such description in docs:
https://www.postgresql.org/docs/current/upgrading.html
> Minor releases never change the internal storage format and are always compatible with earlier and later minor
releasesof the same major version number. For example, version 10.1 is compatible with version 10.0 and version 10.6.
Similarly,for example, 9.5.3 is compatible with 9.5.0, 9.5.1, and 9.5.6.
Seems opposite.
regards, Sergei