[Zope] change variable

[Chris McDonough]

> I remember a few threads that said that REQUEST.set can give
memory leaks.
> Chris, could you give us the correct story about this?

I'd like to, but I'm not certain that I know for sure... adding
objects as attributes of REQUEST *shouldn't* cause leak, but there
are so many objects that themselves hold a reference to REQUEST in
Zope, that it's feared that it's eminently possible to create a
circref using REQUEST.set.  It would be nice if somebody wanted to
spend the time to figure out when and if this could happen.

- C