repositories - pinning down discovery behaviour

[Aaron Bentley]

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Denys Duchier wrote:

| the uuid idea is just your "bit" idea, but with a lot more entropy :-)

I'm not sure I like the notion of using UUIDs here, because we also
encourage the use of cp on, e.g. standalone branches.  So the UUIDs
cease being unique fairly quickly.  Sorry if I'm being hard-to-please.

Aaron
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