problem with bit(n) type

Hi, List!

kosten=# select version();
                                  version
---------------------------------------------------------------------------
 PostgreSQL 8.0.0rc5 on i686-pc-linux-gnu, compiled by GCC gcc (GCC) 3.2.3
(1 row)

kosten=# create table foo(t bit(4));
CREATE TABLE

kosten=# insert into foo values(B'0011');
INSERT 985996 1

kosten=# select t from foo;
  t
------
 0011
(1 row)

But if I do something like this:
kosten=# select t::text from foo;
ERROR:  cannot cast type bit to text

I get an error. Okay the system cannot  cast bit to text...
But this is the big problem for me... Is there a way to cast bit(n) to
text or varchar?

thanks in advance.

Sergey Karin

PS. I have found that there are some functions: varbit_in() and
varbit_out(). But they works with internal type cstring. And I cannot
cast cstring to varchar or text.