[MERGE] Port across errors for shallow branch support.

[Aaron Bentley]

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Robert Collins wrote:
>> Why are both the repository format and the branch format required to be
>> stackable?
> 
> Because both branch and repository are changing to allow shallow
> branches that scale well. I posted previously about this.

You posted about stacking, but I don't think you said anything about why
stacked branches was the best-scaling option.  Last I see, you're still
mulling three options, only one of which is branch stacking.

Aaron
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