Question for Notes hackers

I got a question from Julian Robichaux about Agent Boost. I think this will become a common use for Agent Boost and I hope I can find him an answer:

The first agent I wrote was to try to log what changed on a document when it gets saved. I set up a "before document is modified or saved" agent that gets two references to the doc: one using session.DocumentContext (the doc that's about to be saved) and one using db.GetDocumentByUNID(bs.UniversalID). Both of these are returning a reference to the in-memory document though.

I was hoping there was a way to get a reference to both the in-memory doc (with the pending changes) and the on-disk doc (without the changes), so I could compare them. Sort of like how you can use either NSFDbGetNoteInfo or NSFNoteGetInfo.

So I guess the question is, do you know of a way to do that within the context of AgentBoost?

I know the problem is the caching behaviour built into the Notes LSXBE object apis, I think I've seen this same problem in other contexts, anyone know solutions to this?

BTW Julian gave me some very helpful feedback on Agent Boost as well. Thanks Julian!

Update: Julian puts more info about the problem on his blog.
Update 2: An answer is found and Julian completes his solution. BTW I'd like to add this to the examples, is that ok Julian?