Module Rig_bin.Version
rig's version, the rig package's.
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val v : stringv is the version, as "1.0.0~alpha3", which rig --version prints.
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val session : stringsession is what a session's first line carries: v and the version of the protocol between a job's processes, as "1.0.0~alpha3 protocol 5". A machine's half and rig run speak to each other only at one session: builds of one release can speak different protocols.