Jeff Janes <jeff.janes@gmail.com> writes:
> One thing from the commit-message:
> "On-disk, we can still store it in words, so as to not break on-disk
> compatibility with beta1."
> Hasn't that ship already sailed?
No.
> Or is the concern about intra-version pg_upgrade rather than direct
> on-disk compatibility?
This. You can pg_upgrade across a catversion bump, but not across
changes in user table or index contents.
regards, tom lane