How to insert zeros into a bytea column?

Hello,

I'm inserting data into a bytea colunm which can contain zero bytes. It
seems that insertion stops at first zero:

gkk=# CREATE TABLE test (id int4, adat bytea);
CREATE
gkk=# insert into test (id, adat) values (1, '\100\200\000\100\200');
INSERT 164175 1
gkk=# select * from test;
id | adat
----+-------
1 | @\200
(1 row)

gkk=# select get_byte(adat,1) from test;
get_byte
----------
128
(1 row)

gkk=# select get_byte(adat,2) from test;
ERROR: byteaGetByte: index 2 out of range [0..1]

How to insert in a correct way?

Thanks,
Lajos