[bbc:MERGE] Change the ordering for chk inventory lines

[Robert Collins]

On Thu, 2009-02-19 at 11:38 -0600, John Arbash Meinel wrote:
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> Since we are still in the middle of format-breaking changes, this
> changes the serialized form for the meta-block. It doesn't change what
> is written, just the order. The big idea is to put things that don't
> change often together, and things that do change often together.
> 
> This doesn't make a huge difference in compression, but it does make a
> difference. Basically, it saves a "copy" group or two.
> 
> It also changes the "deserialise" code to be a bit more flexible about
> ordering. Which means the same deserialise code can handle all current
> layouts.

Is there any performance hit? Being flexible here isn't really
needed :P.	

-Rob
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