potential bug in JSON

I've found a potential bug. Why the "->" operator returns JSON instead of
TEXT? It doesn't make sens for me, and the documentation doesn't inform
about that.

postgres=# SELECT ('{"id": 1}'::json -> 'id')::int;
ERROR: cannot cast type json to integer
LINE 1: SELECT ('{"id": 1}'::json -> 'id')::int;

postgres=# SELECT ('{"id": 1}'::json -> 'id')::text::int;
int4
------
1
(1 row)

postgres=# SELECT version();
version

---------------------------------------------------------------------------------------------------------------
PostgreSQL 9.3beta1 on x86_64-unknown-linux-gnu, compiled by gcc
(Ubuntu/Linaro 4.7.3-1ubuntu1) 4.7.3, 64-bit
(1 row)