mutable flag

diff --git a/lib/sqlalchemy/types.py b/lib/sqlalchemy/types.py
index 47c9d73df8cccdc8c786df7d015cc68deececb33..6f4892530fecf00f45f47015f1fa8de1ed8be61c 100644 (file)
--- a/lib/sqlalchemy/types.py
+++ b/lib/sqlalchemy/types.py
@@ -251,6 +251,8 @@ class PickleType(MutableType, TypeDecorator):
             return self.pickler.dumps(x, self.protocol) == self.pickler.dumps(y, self.protocol)
         else:
             return x is y
+    def is_mutable(self):
+        return self.mutable
         
 class Boolean(TypeEngine):
     pass