[tor-bugs] #19958 [Core Tor/Tor]: Implement proposal 264 (protocol versioning)

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#19958: Implement proposal 264 (protocol versioning)
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     Reporter:  nickm         |      Owner:
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.2.9.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:  #15055
       Points:                |   Reviewer:
      Sponsor:                |
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 This is not 100% strictly necessary for #15055 to work, but every time we
 change a protocol, we will wish that we had included this feature.

 Mostly implemented in a fit of C while I was on vacation.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19958>
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