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This change limits the amount of `wants` and `haves` data that is sent to the serving side of a fetch. When a `RefsAt` announcement is sent, the fetching peer can calculate the difference between the `rad/sigrefs` they're aware of -- if it exists -- and the newly advertised `rad/sigrefs`. This means they can efficiently ask for the `wants` and `haves` of references that have changed -- saving some data sent over to the serving side. Signed-off-by: Fintan Halpenny <fintan.halpenny@gmail.com> X-Clacks-Overhead: GNU Terry Pratchett