BUG #5152: Exporting databases with pg_dump changes 'bigserial' to 'bigint'

The following bug has been logged online:

Bug reference:      5152
Logged by:          S. Neumann
Email address:      simon.neumann@communology.com
PostgreSQL version: 8.3.7 and 8.4.1
Operating system:   Microsoft Windows
Description:        Exporting databases with pg_dump changes 'bigserial' to
'bigint'
Details:

When exporting databases using pg_dump column types that are 'bigserial'
become 'bigint'. This problem did not occur on 8.0.8 on linux.

Steps to reproduce:
===================
1) Create a simple table using the 'bigserial' data type:
CREATE TABLE test
(
  id bigserial NOT NULL,
  something text NOT NULL,
  CONSTRAINT pk_performance_ts PRIMARY KEY (id)
)
WITH (OIDS=FALSE);

2) Export the database content with pg_dump (assuming the database is called
'test':
pg_dump -O -x -E UTF-8 -f <filename> test

Result:
=======
The exported plain SQL file contains the create statement:
--
-- Name: test; Type: TABLE; Schema: public; Owner: -; Tablespace:
--

CREATE TABLE test (
    id bigint NOT NULL,
    something text NOT NULL
);

that differs from the statement used in 1) as the data type of column 'id'
now is 'bigint' and no longer bigserial.