On Thu, Mar 1, 2018 at 10:10 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
I wrote: > I don't see anything in the commit message or linked discussion to > indicate that any visible behavior change was intended, so I think > you're right, this is a bug. Will check and push your patch.
Actually, this patch still wasn't quite right: although it fixed one aspect of the behavior, it still produced identical results for typemod NULL and typemod -1, which as the function's comment explains is not what should happen. I tweaked the logic to look as much as possible like before, and added a regression test.