Prevent numeric literals from having non-numeric trailing characters (Peter Eisentraut)

Regarding the changes made in version 15 for the traitment of the non-numeric
trailing characters, why does parsing continue to be permissive with
parentheses (no need to add a space)? Are we still in standard SQL?

Regards

Fabrice

SELECT (123)order by 1;
+----------+
| ?column? |
+----------+
| 123 |
+----------+
(1 row)

postgres [2043238]=# SELECT (123)abc;
+-----+
| abc |
+-----+
| 123 |
+-----+
(1 row)