[CentOS] centos 4.x repo on mirrors

hi, while all the centos 3.x release points to the 3.6 on all mirror sites, the 4.x series still has it's own directory. why are not these just links to 4.2? yours.

lrwxrwxrwx 1 97 ftp 3 Nov 10 01:31 3 -> 3.6/ lrwxrwxrwx 1 97 ftp 3 Nov 3 21:01 3.1 -> 3.3/ lrwxrwxrwx 1 97 ftp 3 Nov 3 21:01 3.3 -> 3.4/ lrwxrwxrwx 1 97 ftp 3 Nov 3 21:01 3.4 -> 3.5/ lrwxrwxrwx 1 97 ftp 3 Nov 10 01:31 3.5 -> 3.6/ drwxrwxr-x 14 root root 4096 Oct 28 17:31 3.6/ lrwxrwxrwx 1 97 ftp 3 Nov 3 21:01 4 -> 4.2/ drwxr-xr-x 2 root root 4096 Jul 18 23:11 4.0/ drwxr-xr-x 2 root root 4096 Oct 21 19:54 4.1/ drwxrwxr-x 12 root root 4096 Oct 13 13:59 4.2/