Duplicating folders automatically increases numeric folder suffix

If you have a folder that is named “Round 1”, and you Option + Drag/Drop to duplicate it, the new folder will automatically be named “Round 2”.  Do it again and you’ll have “Round 3”.

Editor’s note: Can anyone test this in pre-Snow-Leopard versions of Mac OS X? I’m not sure whether this is exclusive to 10.6.

Update: One commenter reports this works in 10.5.8 Leopard.