TEXT::CIDR/INET::CIDR output confusion

It looks a bit strange that CIDR output depends on datatype it has been
casted from:

fduch=# SELECT '1.1.1.1'::cidr;   cidr
------------1.1.1.1/32
(1 row)

fduch=# SELECT '1.1.1.1'::inet::cidr; cidr
---------1.1.1.1
(1 row)


However these two seem to be 'equal' in terms of backend:

fduch=# SELECT '1.1.1.1'::inet::cidr = '1.1.1.1'::inet;?column?
----------t
(1 row)

fduch=# SELECT '1.1.1.1'::inet::cidr = '1.1.1.1'::cidr;?column?
----------t
(1 row)


I'm just curious how can it even be...

fduch=# SELECT version();                                           version
------------------------------------------------------------------------------------------------PostgreSQL 7.4.5 on
i386-portbld-freebsd5.3,compiled by GCC cc (GCC) 3.4.2 [FreeBSD] 20040728
 


-- 
Fduch M. Pravking