docker / libkv / 28

84%

Pull #14

travis-ci

API Change: AtomicPut with previous = nil is create.

AtomicPut can now be used to Compare-and-Swap against the state
where the key doesn't yet exist.  E.g. a race where two clients
create the same key: one succeeds, the other fails.

Pass nil for the previous argument of AtomicPut for this
behavior.  Before, this would cause an error.

Implements this change for all three backends.

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