Can simultaneously download two files with the same name, one will replace the other

If I try and download two files with the same name from two different locations, Epiphany reports both as downloading, but only the second file appears on the desktop. (Presumably the first is downloading to a now nameless file location.) You may need to download a fairly big file to see this in action.

This may seem like an edge case, but I actually discovered it trying to download the "Windows/Mac" (AVI) versions of http://video.google.com/videoplay?docid=9076288729387457440 and http://video.google.com/videoplay?docid=959125392868390030 simultaneously: both files want to be called "RickyGervaisMicrosof.avi"

Steps to reproduce:
1. Go to http://video.google.com/videoplay?docid=9076288729387457440, and click the "Download" button. Epiphany will pop up the Download dialog and inform you that RickyGervaisMicrosof.avi is downloading.
2. Before the above download completes, go to http://video.google.com/videoplay?docid=959125392868390030 and click the "Download" button. A separate, differently sized RickyGervaisMicrosof.avi file will appear in the Download dialog. ~/Desktop/RickyGervaisMicrosof.avi.part will now contain the contents of this second file and the first, while continuing to download, cannot be accessed via the file system.