On Wednesday, March 25, 2026, Nikolay Samokhvalov <
nik@postgres.ai> wrote:
If you don't know anything about implementation, it is natural to
expect that something new will work only when both old and new
clusters support it.
But we don’t call out “new features” in the documentation. Just “features”. And so when the pg_upgrade docs says “pg_upgrade supports upgrades from 9.2.X and later” then unless there is a note to the contrary (which there is not here) that applies to everything pg_upgrade does.
Put differently, read the docs as if you were unaware in which version that capability was introduced. This is the style/assumption the documentation is written in/using.
David J.
