Ticket #11303: clean_initial_value.diff

django/forms/forms.py

@@ -287 +287 @@
                     hidden_widget = field.hidden_widget()
                     initial_value = hidden_widget.value_from_datadict(
                         self.data, self.files, initial_prefixed_name)
+                    try:
+                        initial_value = field.clean(initial_value)
+                    except ValidationError:
+                        pass
                 if field.widget._has_changed(initial_value, data_value):
                     self._changed_data.append(name)
         return self._changed_data