I've got a form that contains a number of textfields, as well as a
file upload element.
I've noticed that this field doesn't retain it's data after validation
errors. While I know html/http doesn't allow form fields to be pre-
populated per se, it can be faked by stuffing it into the session.
Is there any accepted pattern/best practice for faking it that doesn't
require the file to be tacked to the session?