This whole thread reminds me of diffable: 
http://www.stevesouders.com/blog/2010/07/09/diffable-only-download-the-deltas/ 
which can probably used for the same purpose.

On Thursday, April 26, 2012 at 7:05 AM, Brandon Benvie wrote:

> In theory it would be possible with some work. If I was doing it, my starting 
> point would be to implement a membrane targeted at hot swapping objects and 
> functions (using tools I've already made for such tasks  
> https://github.com/Benvie/meta-objects). That is, I'd make it so I could swap 
> out the actual object or function that is mirrored, yet retain same-identity 
> externally. That is the first major hurdle to really achieving true hot 
> swapping, because there's no way to come in after the fact and try and play 
> cleanup duty and expect it to work. Once the references are disseminated 
> there's nothing that can be done except for rebooting the context. But if 
> you're able to protect and control those references (using the membrane 
> concept) you can sidestep around the issue and get on to the other 
> difficulties with the idea. I do think it's possible to do. 
> 
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