On Nov 12, 2007 12:59 AM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> I'm not clear on what you're proposing. There is no such thing as an
> opclass with no operators (or at least, not a useful one), so this seems
> mutually contradictory.
>
> regards, tom lane
>
You're right, that's my mistake, sorry. So, having casting rules seems
to be the only option..