[tor-bugs] #26859 [Core Tor/Tor]: Spec: improve contextual description of EXTEND->CREATE / CREATED->EXTENDED handling and payloads

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#26859: Spec: improve contextual description of EXTEND->CREATE / CREATED->EXTENDED
handling and payloads
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     Reporter:  dmr           |      Owner:  (none)
         Type:  enhancement   |     Status:  new
     Priority:  Low           |  Milestone:
    Component:  Core Tor/Tor  |    Version:
     Severity:  Minor         |   Keywords:  tor-spec
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
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 catalyst noted in `#tor-dev` that `5.1.2 (EXTEND and EXTENDED) says
 nothing explicitly` about an OR's (`relays receiving an EXTEND or EXTEND2
 cell`) responsibility `to send a corresponding CREATE/CREATE2 cell to the
 requested next node`.

 catalyst, asn, nickm, and I chatted a bit about it.
 I bought up that `5.3 mentions an OR's role of translating EXTEND ->
 CREATE and CREATED -> EXTENDED` and suggested we might `reference that
 section from 5.1 and 5.1.2`.

 It's probably enough to do that, but if some other change makes more sense
 (when actually putting together the wording), do that.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26859>
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