logilab-astng #79002 Test failure with latest release [open]

Hello, while preparing the Debian package for astng 0.23.0 I got this error running tests (both for 2.6 and 2.7):
========================  unittest_lookup.py  ========================
F....................
======================================================================
FAIL: test_builtin_lookup (unittest_lookup.LookupTC)
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Traceback (most recent call last)
  File "/tmp/buildd/logilab-astng-0.23.0/build/lib.linux-x86_64-2.7/logilab/common/testlib.py", line 644, in _proceed
    testfunc(*args, **kwargs)
  File "/tmp/buildd/logilab-astng-0.23.0/test/unittest_lookup.py", line 287, in test_builtin_lookup
    self.assertIs(intstmts[0], nodes.const_factory(1)._proxied)
  File "/usr/lib/python2.7/unittest/case.py", line 815, in assertIs
    self.fail(self._formatMessage(msg, standardMsg))
  File "/usr/lib/python2.7/unittest/case.py", line 408, in fail
    raise self.failureException(msg)
AssertionError:  is not 
Cheers, Sandro
prioritynormal
typebug
done in<not specified>
closed by<not specified>