uranusjr commented on a change in pull request #19267:
URL: https://github.com/apache/airflow/pull/19267#discussion_r738050986



##########
File path: airflow/serialization/serialized_objects.py
##########
@@ -409,16 +407,26 @@ def _value_is_hardcoded_default(cls, attrname: str, 
value: Any, instance: Any) -
             return True
         return False
 
+    @classmethod
+    def _serialize_param(cls, param: Param):
+        d = param.dump()
+        d['value'] = cls._serialize(d['value'])
+        return d
+
+    @classmethod
+    def _deserialize_param(cls, param: Dict):
+        param_class = import_string(param['__class'])
+        param['value'] = cls._deserialize(param['value'])
+        return param_class(default=param['value'], 
description=param['description'])

Review comment:
       How does this work with DAGs already serialised in the database? Do we 
need to implement some detection to ensure those entries can be deserialised 
correctly?




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