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

[Tor Bug Tracker & Wiki]

#20218: Fix and refactor and redocument routerstatus_has_changed
-------------------------------------------------+-------------------------
 Reporter:  nickm                                |          Owner:  nickm
     Type:  defect                               |         Status:
                                                 |  assigned
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.4.3.x-final
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  ipv6, 029-proposed, tor-control,     |  Actual Points:  0.5
  easy, spec-conformance, review-group-31,       |
  034-triage-20180328, 034-removed-20180328      |
Parent ID:                                       |         Points:  .1
 Reviewer:  teor                                 |        Sponsor:
-------------------------------------------------+-------------------------
Changes (by teor):

 * status:  needs_review => assigned
 * reviewer:  nickm, teor => teor
 * owner:  (none) => nickm


Comment:

 Nick is going to write some tests, and then I'll review and merge the
 whole branch.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20218#comment:45>
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