add a test to check for the sign bit bug in ujson 1.9

python/tests.py

@@ -588,6 +588,12 @@ class UltraJSONTests(TestCase):
             else:
                 assert False, "expected OverflowError"
 
+    def test_decodeNumberWith32bitSignBit(self):
+        """Test that numbers that fit within 32 bits but would have the
+        sign bit set (2**31 < x < 2**32) are decoded properly."""
+        doc = '{"id": 3590016419}'
+        self.assertEqual(ujson.decode(doc)['id'], 3590016419)
+               
 """
 def test_decodeNumericIntFrcOverflow(self):
 input = "X.Y"