Tested pluralization of decimals.

Refs #16723.

tests/defaultfilters/tests.py

@@ -654,6 +654,9 @@ class DefaultFiltersTests(TestCase):
         self.assertEqual(pluralize(1), '')
         self.assertEqual(pluralize(0), 's')
         self.assertEqual(pluralize(2), 's')
+        self.assertEqual(pluralize(decimal.Decimal(1)), '')
+        self.assertEqual(pluralize(decimal.Decimal(0)), 's')
+        self.assertEqual(pluralize(decimal.Decimal(2)), 's')
         self.assertEqual(pluralize([1]), '')
         self.assertEqual(pluralize([]), 's')
         self.assertEqual(pluralize([1, 2, 3]), 's')