a bug of bash

In your home directory, under bash, input 'cd //', what do you get?

[root@localhost ~]# pwd
/root
[root@localhost ~]# cd //
[root@localhost //]# pwd
//
[root@localhost //]# ls
bin  boot  data  dev  etc  home  initrd  lib  lost+found  media  misc  mnt  opt  proc  root  sbin  selinux  srv  sys  test  tmp  usr  var
[root@localhost //]#

[root@localhost /]# help
GNU bash, version 3.00.15(1)-release (i386-redhat-linux-gnu)
......