Hello Tom.

I have a question about procedure/function overloading in Oracle.
I knew that we can overload a procedure using different types or different number of parameters.
To my surprise I found we can also overload with different parameter names even if they are of the same type.
This is an example.
Procedure test has two overloads that differ only in parameter name!

create or replace package demo as
  procedure test(a_num_param in number);
  procedure test(a_num2_param in number);
end;
/
create or replace package body demo as
  procedure test(a_num_param in number) is
  begin
    dbms_output.put_line('1');
  end;

  procedure test(a_num2_param in number) is
  begin
    dbms_output.put_line('2');
  end;
end;
/

When calling the procedure with named parameters it calls the correct overload.
When calling without named parameters fails with ORA-00307 exception.

exec demo.test(a_num_param => 100); -- success
exec demo.test(a_num2_param => 100); -- success
exec demo.test(1); -- failure PLS-00307

I develop in Oracle Database 12c Standard Edition Release 12.2.0.1.0 and I don't currently have access to previous releases.
So, I wonder if this type of procedure overload is a new feature or if it works in previous releases also.
I didn't find relevant info in the documentation and in fact I didn't find anywhere a mention for procedure overload using only different parameter names.

Could you please clarify if this is a new feature or if it exists in previous releases also.