Peter Eisentraut <peter_e@gmx.net> writes:
> I doubt that it ever really worked, or could work, to install a new
> version over an old one without deleting the old one first. This here is
> just one problem. We can't be making these funny workarounds every time
> the set of installed user visible files changes. For example, if an older
> version had a header file that the new version doesn't have, then user
> code that includes this file will still be silently broken.
Well, the idea is to make the breakage be not so silent ...
regards, tom lane