Confusion about CREATE OPERATOR syntax.

Hi guys!

I'm the creator of the PostgreSQL Database Modeler and I'm improving the
reverse engineering feature after some requests from the users.

I've stumbled on a bug when importing operators and while I was writing a
fix for that bug a great confusion came into my mind. It's about the CREATE
OPERATOR syntax, more specifically, about the LEFTARG and RIGHTARG
attributes.

I've read the docs but cannot find a proper answer and that's why I'm
here... I hope you guys can help me. Well, my doubt is: when specifying
LEFTARG and RIGHTARG the datatypes should be written in the complete form?
By "complete form" I mean specifying the precision and/or length... For
instance, I want to create an operator to handle certain operation between
two numeric(5,2) values, said that, my operator should be written as:

CREATE OPERATOR ++ (
PROCEDURE = func_name(numeric,numeric),
LEFTARG = numeric,
RIGHTARG = numeric
)

Or(?):

CREATE OPERATOR ++ (
PROCEDURE = func_name(numeric,numeric),
LEFTARG = *numeric(5,2)*,
RIGHTARG = *numeric(5,2)*
)

Well, I've tested both forms and them work fine. If I try to run one after
another an error will raise for the second reporting that the operator
already exists. Is PostgreSQL simply interpreting them as the same? Is the
precision/length ignored/not needed?

Thanks in advance and forgive my rusty English, I'm Brazilian! :)
--
Raphael Araújo e Silva
pgModeler Project Developer

raphael(at)pgmodeler(dot)com(dot)br
http://pgmodeler.com.br
https://github.com/pgmodeler