[tor-bugs] #27649 [Core Tor/Tor]: rust protover double-counts protocol versions

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#27649: rust protover double-counts protocol versions
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 Reporter:  cyberpunks      |          Owner:  (none)
     Type:  defect          |         Status:  new
 Priority:  Medium          |      Milestone:
Component:  Core Tor/Tor    |        Version:
 Severity:  Normal          |     Resolution:
 Keywords:  rust, protover  |  Actual Points:
Parent ID:                  |         Points:
 Reviewer:                  |        Sponsor:
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Comment (by cyberpunks):

 Attempt at fixing this in branch rust-protoverlap1 at
 https://gitgud.io/onionk/tor.git

 Writing that, it also seems like leaving version zero as a reserved value
 is useful for protover implementations like this, since 0 is the initial
 value of `last_high` as a placeholder for 'no version seen yet.'

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27649#comment:1>
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