When uploading multiple files, the order of the attachments is not preserved

Steps to reproduce the problem :

-use the Attach form to attach 10 alphabetical consecutive filenames in one operation(eg. a1,a2,a3,a4,....a10)

You will see that after they get attached, the order will not be a1,a2,a3,...a10.

Tried this with 10 filenames, all of them same size (0 bytes), and i got this order : 9,7,8,5,6,3,10,4,2,1.