"...functionality to handle potential namespace collisions, but that seems much more simple."

Shure, may be it's simple. I wonder how i would do that. Perhaps adding a GUID to each file with the same name?

foo.pl.e891346b-a18e-43eb-bd6c-fa6267c568e3
foo.pl.6b97a88c-e742-43c3-9f71-a004685be89e
foo.pl.1b7b0031-981f-4ac0-a0c5-5582735528c8
foo.pl.d82d0bcc-26b5-4b8d-9fa1-950f2b27d2b3
foo.pl.bb388fbf-f8a6-4511-93ce-f6d2b737cf00
...
[download]

Perhaps there are many thousands more with the same name but different content, who knows...

And know? Not very convinient and practical if one needs to do further processing on this files. Looks a bit like LOST+FOUND ;-)

Best regards, Karl