Does pacman re-download even the same db on pacman -Sy?

let's say a maniac does
sudo pacman -Syu
every 2 minutes.
now in 2 minutes, nothing is changed..
does pacman asks for the filesize of the db, and if *exactly* the same, does it re-download it or not?
and if does, then why?

ok, it should be implemented. The last week I was worried on all guys by default getting packages from archlinux.org
at least same db should not be downloaded twice, and that can save some bandwitdh I hope.
http://bugs.archlinux.org/index.php?do=details&id=1492
btw, you all know, but md5sum has had a collision detection in august
http://en.wikipedia.org/wiki/Md5sum

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