ferruzzi commented on code in PR #73294:
URL: https://github.com/apache/airflow/pull/73294#discussion_r4067272740


##########
task-sdk/src/airflow/sdk/definitions/deadline.py:
##########
@@ -154,14 +154,22 @@ def __init__(
         callback: Callback,
         name: str | None = None,
     ):
+        if not isinstance(interval, (timedelta, VariableInterval)):
+            raise ValueError(
+                f"Interval must be a `timedelta` or a `VariableInterval`, 
received {type(interval).__name__}."
+            )
+
+        # Serializing blocks subclasses for security reasons, so isinstance is 
too loose.
+        if type(callback) not in (AsyncCallback, SyncCallback):

Review Comment:
   That's also fair, I was avoiding another core/sdk coupling, but they _are_ 
already coupled so it's likely better to just reuse a shared tuple.  I'll make 
the change. 



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