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Changes between Initial Version and Version 4 of Ticket #19537

-              initial
+              v4
+django.forms.CheckboxInput
+have method
+`django.forms.CheckboxInput` have method
+{{{
 def _has_changed(self, initial, data):
     # Sometimes data or initial could be None or u'' which should be the
     # same thing as False.
     return bool(initial) != bool(data)
+}}}
 initial may be u'False' or u'True'
 bool(initial) always return True for unicode len(initial) > 1
 …
 bool(u'on') = True
 path:
+{{{
 def _has_changed(self, initial, data):
     initial = True if initial == u'True' else False
     return initial != bool(data)
+}}}