#18898: has_changed fails to compare model instance with primary key
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     Reporter:  adsva   |                    Owner:  nobody
         Type:  Bug     |                   Status:  new
    Component:  Forms   |                  Version:  1.4
     Severity:  Normal  |               Resolution:
     Keywords:          |             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 tuxcanfly):

 Trying a fix by updating has_changed to check on both string and python
 values.

 Added test for ModelMultipleChoiceField as well. Verified that all tests
 pass on sqlite.

 Needs review: https://github.com/django/django/pull/660

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Ticket URL: <https://code.djangoproject.com/ticket/18898#comment:3>
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