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-rw-r--r--Lib/test/test_builtin.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/Lib/test/test_builtin.py b/Lib/test/test_builtin.py
index 6671f2c..19ce9ec 100644
--- a/Lib/test/test_builtin.py
+++ b/Lib/test/test_builtin.py
@@ -1224,6 +1224,9 @@ class BuiltinTest(unittest.TestCase):
self.assertEqual(round(-5.5), -6)
self.assertEqual(round(-6.5), -7)
+ # Issue #1869: integral floats should remain unchanged
+ self.assertEqual(round(5e15+1), 5e15+1)
+
# Check behavior on ints
self.assertEqual(round(0), 0)
self.assertEqual(round(8), 8)