pgsql 7.1: int4out() brokeness?

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POSTGRESQL BUG REPORT TEMPLATE
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Your name : James Troup
Your email address : james@nocrew.org

System Configuration
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Architecture (example: Intel Pentium) : Intel Pentium

Operating System (example: Linux 2.0.26 ELF) : Linux 2.4.0 ELF

PostgreSQL version (example: PostgreSQL-7.0) : PostgreSQL-7.1 snapshot (from 2001-01-07 or -08)

Compiler used (example: gcc 2.8.0) : gcc 2.95.2

Please enter a FULL description of your problem:
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int4out() seems to be broken which in turn breaks ODBC.

With pgsql 7.1:

| template1=# create table x (y int4); insert into x values (31); select y, int4out(y) from x;
| CREATE
| INSERT 34029 1
| y | int4out
| ----+-----------
| 31 | 136420312
| (1 row)

With pgsql 7.0.3:

| template1=> create table x (y int4); insert into x values (31); select y, int4out(y) from x;
| CREATE
| INSERT 35923 1
| y | int4out
| ----+---------
| 31 | 31
| (1 row)

Please describe a way to repeat the problem. Please try to provide a
concise reproducible example, if at all possible:
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As above:

CREATE TABLE x (y int4); INSERT INTO x VALUES (31); SELECT y, int4out(y) FROM x;

Both rows returned should (unless I'm missing something horribly
obvious) be 31.

If you know how this problem might be fixed, list the solution below:
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--
James