Weird WAL numbering

In my logs I have this:

2002-03-05 23:59:26 DEBUG: MoveOfflineLogs: remove 0000000200000054
2002-03-05 23:59:26 DEBUG: MoveOfflineLogs: remove 0000000200000055
2002-03-05 23:59:26 DEBUG: MoveOfflineLogs: remove 0000000200000053
2002-03-05 23:59:38 DEBUG: XLogWrite: new log file created - consider
increasing WAL_FILES
2002-03-06 00:00:10 DEBUG: XLogWrite: new log file created - consider
increasing WAL_FILES
2002-03-06 00:00:23 DEBUG: XLogWrite: new log file created - consider
increasing WAL_FILES
2002-03-06 00:00:25 DEBUG: MoveOfflineLogs: remove 0000000200000057
2002-03-06 00:00:25 DEBUG: MoveOfflineLogs: remove 0000000200000058
2002-03-06 00:00:25 DEBUG: MoveOfflineLogs: remove 0000000200000056
2002-03-06 00:01:38 DEBUG: XLogWrite: new log file created - consider
increasing WAL_FILES

Notice the '2' in the middle of the WAL file name? It was '1' for quite a
while. I get the feeling it increments when an overflow occurs, just as
going from 'FF' to '100' sort of thing.

ie. Is there an endian problem here? Is it purely cosmetic? Is it
deliberate?

usa=# select version();
version
--------------------------------------------------------------
PostgreSQL 7.1.3 on i386--freebsd4.3, compiled by GCC 2.95.2
(1 row)

uname -a
FreeBSD xxx 4.4-RELEASE FreeBSD 4.4-RELEASE #4: Mon Jan 21 0
7:14:44 GMT 2002 xxx:/usr/obj/usr/src/sys/CANAVERAL i386

Chris