[tor-bugs] #20218 [Core Tor/Tor]: Fix and refactor and redocument routerstatus_has_changed

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#20218: Fix and refactor and redocument routerstatus_has_changed
-------------------------------------------------+-------------------------
 Reporter:  nickm                                |          Owner:  (none)
     Type:  defect                               |         Status:
                                                 |  needs_review
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.3.4.x-final
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  ipv6, 029-proposed, tor-control,     |  Actual Points:  0.5
  easy, spec-conformance                         |
Parent ID:                                       |         Points:  .1
 Reviewer:                                       |        Sponsor:
-------------------------------------------------+-------------------------
Changes (by teor):

 * status:  needs_revision => needs_review
 * actualpoints:   => 0.5


Comment:

 This looks fine to me, but it needs a review, and a changes file. It might
 also help if it had unit tests.

 A question for the team:
 How can we make sure we update functions when we add new members to a
 struct?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20218#comment:28>
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