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Interesting! Same here.
Using eval() fails with or without -v:
--- a/Lib/test/test_format.py
+++ b/Lib/test/test_format.py
@@ -289,6 +289,18 @@
 else:
 raise TestFailed, '"%*d"%(maxsize, -127) should fail'
 
+ def test_issue13410(self):
+ class Foo(object):
+ def __init__(self, x):
+ self.x = x
+ def __long__(self):
+ return long(self.x)
+ def __float__(self):
+ return float(self.x)
+ eval(u'%d' % Foo(22))
+ eval('%d' % Foo(22))
+
+
 def test_main():
 test_support.run_unittest(FormatTest)
 
I've put both '%d' and u'%d' here, but it also fails with just one of them.