About the parameter of API: PQprepared

In libpq, the definition is like:

PGresult *
PQprepare(PGconn *conn,
    const char *stmtName, const char *query,
    int nParams, const Oid *paramTypes)

 

Could we remove the parameter "nParams"?

e.g. "insert into foo(id, name, address) values ($1, $2, $3)"

PostgreSQL possibly can parse the prepared sql statement to get the real paramters count.

 

Or, is there another alternate way?