David G Johnston <david.g.johnston@gmail.com> writes:
> Tom Lane-2 wrote
>> Attributes applied to function parameter types --- or result types for
>> that matter --- are entirely ignored by Postgres; only the base type
>> matters. This is documented.
> Maybe it would be more obvious in the section detailing "argtype"...but its
> not like its buried deep in the documentation. The bigger problem is
> understanding exactly what that notes means in reality. Often that means
> getting bit by the behavior first and then reading about what just bit you.
> Happens to all of us.
> I'm for the idea of issuing a syntax error upon seeing "type()" in general
> but not strongly since perfectly valid code (often back-stopped by table
> constraints) currently works and would otherwise have no reason to change
> other than to conform to this decision.
Another possibility is to issue a WARNING or NOTICE rather than hard
error.
regards, tom lane