getstate fix

diff --git a/lib/sqlalchemy/types.py b/lib/sqlalchemy/types.py
index a8fe8b821c6dfae13edefe49b7ca81e40bc190fa..0e3dfe34f7e1a19b17a33e71bb9e787e64691cc0 100644 (file)
--- a/lib/sqlalchemy/types.py
+++ b/lib/sqlalchemy/types.py
@@ -167,7 +167,7 @@ class TypeEngine(AbstractType):
 
     def __getstate__(self):
         d = self.__dict__.copy()
-        d['_impl_dict'] = weakref.WeakKeyDictionary()   # will be optimized in 0.6
+        d.pop('_impl_dict', None)
         return d
 
     def get_col_spec(self):