Robert Haas <robertmhaas(at)gmail(dot)com> writes:
> To me, forcing every tools author to use postgresql.conf parsing tools
> rather than just appending to the file is a needless burden on tool
> authors. I'd vote for just having ALTER SYSTEM silently drop all but
> the last of duplicated entries.
I haven't been paying too close attention to this thread, but isn't
that exactly what it does now and always has? guc.c, at least, certainly
is going to interpret duplicate entries that way.
regards, tom lane