Martijn van Oosterhout <kleptog@svana.org> writes:
> I was thinking of actually also storing the oid in the typelem field
> but the docs imply this does something fancy with subscripting.
Yeah, like enable it ;-). You can't do that unless you are some kind
of array type. typelem pointing at yourself would be particularly
bad news --- probably lead to infinite loops ...
> Would a patch to change the rules be accepted, or would it be
> considered a unnecessary backward incompatable change?
I wouldn't back-patch it, but it seems like something we could still put
in for 8.1.
regards, tom lane