Jeff Davis <pgsql@j-davis.com> writes:
> Also, I think it needs to force the extension version to match the old
> cluster. Otherwise, we could be dealing with on-disk format changes, or
> other complexities.
Yeah, I was thinking we might want --binary-upgrade to specify a
particular extension version in CREATE EXTENSION instead of letting it
default. I have not really thought through the pros and cons of that,
but it seems plausible.
regards, tom lane