bpo-26579: Add object.__getstate__(). (GH-2821)

Copying and pickling instances of subclasses of builtin types
bytearray, set, frozenset, collections.OrderedDict, collections.deque,
weakref.WeakSet, and datetime.tzinfo now copies and pickles instance attributes
implemented as slots.

1 files changed, 1 insertions, 1 deletions

diff --git a/Lib/email/headerregistry.py b/Lib/email/headerregistry.py
index b590d69..543141d 100644
--- a/Lib/email/headerregistry.py
+++ b/Lib/email/headerregistry.py
@@ -218,7 +218,7 @@ class BaseHeader(str):
                 self.__class__.__bases__,
                 str(self),
             ),
-            self.__dict__)
+            self.__getstate__())
 
     @classmethod
     def _reconstruct(cls, value):