On Tuesday, June 8, 2021, Arthur McGibbon <arthur(dot)mcgibbon(at)gmail(dot)com> wrote:
>
>
> Could you point me to the documentation - I could only find
> https://www.postgresql.org/docs/current/sql-prepare.html and it doesn't
> mention how unknown params are handled.
>
https://www.postgresql.org/docs/current/typeconv-union-case.html
And more generally
https://www.postgresql.org/docs/current/typeconv.html
David J.