No length checking for "name" input

PostgreSQL versions: 7.4.x and 8.0.x
(I don't have a 8.1.x installation to test against)

There appears to be no length checking for data types of "name".

For example:
template1=# SELECT length('rpt_cisx_total_principal_amount_of_security_type_between_dates('::name) AS name_len;
name_len
----------
63
(1 row)

I get exactly the same result for this query which is obviously not the same length and yet I get no error?

template1=# SELECT length('rpt_cisx_total_principal_amount_of_security_type_between_dates(date,date)'::name) AS name_len;
name_len
----------
63
(1 row)

I don't know whether you consider this a bug, certainly most of the other data types appear to have range checking as part of the input.

Regards
Donald Fraser