[rfc] [patch] speeding up bzr log with a tree delta iterator

[Aaron Bentley]

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Aaron Bentley wrote:
> Okay, +1 from me.  I've applied it to bzr.ab, and updated it to match
> the current API from Robert's integration.  Can we get another +1 and a
> merge?

Could someone give this a review please?

Thanks,

Aaron
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