Mike Bayer avatar Mike Bayer committed 73413de

cursors needs to be weak key

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     """proxies a DBAPI connection object and provides return-on-dereference support"""
     def __init__(self, pool):
         self._threadfairy = _ThreadFairy(self)
-        self._cursors = {}
+        self._cursors = weakref.WeakKeyDictionary()
         self.__pool = pool
         self.__counter = 0
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