Bundles and --2a

[Robert Collins]

On Wed, 2009-07-15 at 17:15 -0500, John Arbash Meinel wrote:
> 
> So one possibility would be to redefine the meaning of
> 'make_mpdiffs()'
> for CHKInventoryRepository.inventories. Instead of getting the text
> stream of the 'inventory' lines and mpdiffing them, it would instead
> use
> CHKSerializer.write_inventory_to_string() and then mpdiff that set of
> texts.
> 
> (effectively, upcast all inventories to an XML representation, compute
> the mpdiff of that, and then write that into the bundle. On the other
> side, it would do the reverse operation and insert_mpdiffs() on
> 'repo.inventories' would then also be writing data to
> repo.chk_bytes.) 

It could also use the network delta serializer to get direct diffs out.
This would require a bzr that can read that, so probably a bundle format
bump;

I think it would be good to do both:
 - fix the current bug by upcasting
 - add a new bundle that uses semantic deltas not deltas-of-xml.

-Rob
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