[mod_python] Modification of req.filename.

In the mod_python 2.7.X documentation it explicitly says that the "filename"
member of a request object is "read only". In the current 3.X documentation
it has dropped the "read only" designation.

Even with 2.7.10 I was modifying the "filename" member and came to no harm.
Does anyone know of any good reasons for why it cannot be modified? Is it
always safe to do so regardless of which version of mod_python is being used?

--
Graham Dumpleton (grahamd at dscpl.com.au)