Release versioning inconsistency

Hi list,

The recent 9.2 beta releases have used a slightly different numbering
scheme than all previous releases.

It used to be that tarballs for version $VER were always available at:
http://ftp.postgresql.org/pub/source/v$VER/postgresql-$VER.tar.bz2

However, the new releases now use "v9.2.0beta2" for the directory
name, but "9.2beta2" in the tarball file. No big deal for most people,
but it will confuse people who have scripts to download PostgreSQL
tarballs automatically (e.g. packagers).

For example: http://ftp.postgresql.org/pub/source/v9.2.0beta2/postgresql-9.2beta2.tar.bz2

Is there any reason behind this change?

Regards,
Marti