vincbeck commented on code in PR #28900:
URL: https://github.com/apache/airflow/pull/28900#discussion_r1262678233


##########
airflow/models/dag.py:
##########
@@ -1378,6 +1379,37 @@ def normalized_schedule_interval(self) -> 
ScheduleInterval:
             _schedule_interval = self.schedule_interval
         return _schedule_interval
 
+    @staticmethod
+    @internal_api_call
+    @provide_session
+    def fetch_callback(
+        dag: DAG,
+        dagrun: DagRun | DagRunPydantic,
+        success: bool = True,
+        reason: str | None = None,
+        session: Session = NEW_SESSION,
+    ):

Review Comment:
   If I add annotations then mypy will analyse the code and mypy-core will 
complain about:
   
   ```
   airflow/models/dag.py:1411: error: TypedDict "Context" has no key "reason"
   [typeddict-unknown-key]
                   context["reason"] = reason
   ```
   
   I spent a lot of time trying to resolve it with no chance. If you have any 
solution I am definitely interested. The only solution I could find to bypass 
this problem is to not add annotations. This might feel like I am hiding an 
issue, but this is how it is today, I dont introduce something new, I just keep 
it as is



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