[MERGE] Refactor fetch: add get_data_about_revision_ids to repository, and other changes.

[Aaron Bentley]

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Andrew Bennetts wrote:
> Andrew Bennetts wrote:
>> I've addressed all the review comments, but here's a new bundle.  The part I
>> want feedback on is the new method name, and its description:
>> item_keys_introduced_by(revision_ids).
> 
> Ahem.  And here's a *current* bundle, after actually committing the relevant
> changes.  Sorry for the noise!

You've introduced a new public interface, but you haven't tested it
directly.  In particular, RemoteRepository seems to lack an
implementation of item_keys_introduced_by.

Aaron

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