Issue #12744: Fix inefficient representation of integers
between 2**31 and 2**63 on systems with a 64-bit C "long".
diff --git a/Lib/test/pickletester.py b/Lib/test/pickletester.py
index f90d348..ad15fe8 100644
--- a/Lib/test/pickletester.py
+++ b/Lib/test/pickletester.py
@@ -1118,6 +1118,16 @@
empty = self.loads(b'\x80\x03U\x00q\x00.', encoding='koi8-r')
self.assertEqual(empty, '')
+ def test_int_pickling_efficiency(self):
+ # Test compacity of int representation (see issue #12744)
+ for proto in protocols:
+ sizes = [len(self.dumps(2**n, proto)) for n in range(70)]
+ # the size function is monotonous
+ self.assertEqual(sorted(sizes), sizes)
+ if proto >= 2:
+ self.assertLessEqual(sizes[-1], 14)
+
+
# Test classes for reduce_ex
class REX_one(object):