change note

.gitignore

@@ -15,3 +15,4 @@ coverage.xml
 .installed.cfg
 .dir-locals.el
 dist
+htmlcov

CHANGES.rst

@@ -7,15 +7,21 @@
 - Fix the hashcode of Python ``TimeStamp`` objects on 64-bit Python on
   Windows. See https://github.com/zopefoundation/persistent/pull/55
 
-4.2.2 (2016-11-29)
-------------------
-
 - Stop calling ``gc.collect`` every time ``PickleCache.incrgc`` is called (every
   transaction boundary) in pure-Python mode (PyPy). This means that
   the reported size of the cache may be wrong (until the next GC), but
   it is much faster. This should not have any observable effects for
   user code.
 
+- Stop clearing the dict and slots of objects added to
+  ``PickleCache.new_ghost`` (typically these values are passed to
+  ``__new__`` from the pickle data) in pure-Python mode (PyPy). This
+  matches the behaviour of the C code.
+
+
+4.2.2 (2016-11-29)
+------------------
+
 - Drop use of ``ctypes`` for determining maximum integer size, to increase
   pure-Python compatibility. See https://github.com/zopefoundation/persistent/pull/31
 

persistent/persistence.py

@@ -422,8 +422,11 @@ class Persistent(object):
             _OSA(self, '_Persistent__flags', None)
 
         if clear:
-            idict = _OGA(self, '__dict__', None)
-            if idict is not None:
+            try:
+                idict = _OGA(self, '__dict__')
+            except AttributeError:
+                pass
+            else:
                 idict.clear()
             type_ = type(self)
             # for backward-compatibility reason we release __slots__ only if