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Changes between Version 11 and Version 14 of Ticket #26819

-              v11
+              v14
+It happens on a second save (when there is already data to be validated)
+On this line: "if row_data in seen_data:", because row_data contains a list and seen_data is a set (row_data: (1, [1, 1]) / seen_data: set())
+Example to reproduce:
+models:
+{{{#!python
+class Map(models.Model):
+    name = models.CharField(_('name'), max_length=128)
+class MapSpot(models.Model):
+    map = models.ForeignKey('body.Map', related_name='spots')
+    position = ArrayField(models.IntegerField(), size=2)
+    class Meta:
+        unique_together = [('map', 'position')]
+}}}
+admin:
+{{{#!python
+class MapSpotInline(admin.TabularInline):
+    model = MapSpot
+    extra = 0
+@admin.register(Map)
+class MapAdmin(admin.ModelAdmin):
+    inlines = [MapSpotInline]
+}}}