strange bug with gist over box and circle

If I create a gist index over a box and a circle, the index attributes
appear to both have type box.

I don't see any other, similar situations with other types, and I
haven't investigated the cause yet. Most similar situations work fine.

Regards,
Jeff Davis

postgres=# select version();

version
------------------------------------------------------------------------------------------------------
PostgreSQL 8.5alpha1 on x86_64-unknown-linux-gnu, compiled by GCC gcc
(Debian 4.3.4-2) 4.3.4, 64-bit
(1 row)

postgres=# create table foo5(b box, c circle);
CREATE TABLE
postgres=# create index foo5_idx on foo5 using gist (b,c);
CREATE INDEX
postgres=# \d foo5
Table "public.foo5"
Column | Type | Modifiers
--------+--------+-----------
b | box |
c | circle |
Indexes:
"foo5_idx" gist (b, c)

postgres=# \d foo5_idx
Index "public.foo5_idx"
Column | Type | Definition
--------+------+------------
b | box | b
c | box | c
gist, for table "public.foo5"