[tor-bugs] #31492 [Core Tor/Tor]: Update hsv3 spec for unreachable/failed single onion retries using 3 hops

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#31492: Update hsv3 spec for unreachable/failed single onion retries using 3 hops
-------------------------------------------------+-------------------------
 Reporter:  teor                                 |          Owner:  teor
     Type:  task                                 |         Status:
                                                 |  assigned
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.4.2.x-final
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  v3-onion-service-feature-parity,     |  Actual Points:
  prop224, tor-hs, single-onion, ipv6, network-  |
  team-roadmap-august                            |
Parent ID:  #23507                               |         Points:  0.1
 Reviewer:                                       |        Sponsor:
                                                 |  Sponsor27-must
-------------------------------------------------+-------------------------

Comment (by teor):

 See my PR:
 https://github.com/torproject/torspec/pull/90

 This PR covers the changes in #23818 and #23507.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31492#comment:1>
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