Code review comment for lp:~jelmer/bzr/move-interbranch-fetch2

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>> (Probably an actual formal object would be better, but you get the idea)
>
>> Foreign implementations could add new things into the data returned,
>> e.g. 'loom threads', and advise whether they are must-fetch or not,
>> etc.
> That would give us more flexibility, but I'm not sure what that would
> actually gain us. It means the caller has to be aware of the kinds of
> things that are being returned, and it makes the API harder to use (as
> you'd need to do post-processing on the return value). The separation
> between just "always fetch" and "fetch if present" seems sufficient to
> me.

We also need a "fetch into a stacked branch if present in master
branch". We *might* just make that 'fetch if present'.

John
=:->
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