#26609: Add system check for field choices using unorderable iterables
-------------------------------------+-------------------------------------
     Reporter:  Harry Percival       |                    Owner:  Karl
         Type:                       |                   Status:  assigned
  Cleanup/optimization               |
    Component:  Database layer       |                  Version:  dev
  (models, ORM)                      |
     Severity:  Normal               |               Resolution:
     Keywords:  migrations           |             Triage Stage:  Accepted
    Has patch:  0                    |      Needs documentation:  0
  Needs tests:  0                    |  Patch needs improvement:  0
Easy pickings:  0                    |                    UI/UX:  0
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Comment (by Karl):

 I have not been entirely clear on how check error numbers are created. I
 can see where they're documented but it is not self-evident to me whether
 there is a pattern to them. Should this be "E013"? Should it just be added
 into the existing "E004"?

 Also, barring testing against known unstable types, does anyone have any
 clever ways to do this test? I'm going to just check specifically against
 `sets` (`dicts` are something we want to continue to allow, right?). I'll
 use a list so it can be modified in the future if needed, but that's the
 only one I'm currently aware of this problem for.
-- 
Ticket URL: <https://code.djangoproject.com/ticket/26609#comment:10>
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