ashb commented on code in PR #47944:
URL: https://github.com/apache/airflow/pull/47944#discussion_r2002987027


##########
task-sdk/src/airflow/sdk/execution_time/xcom.py:
##########
@@ -40,6 +40,7 @@ def set(
         task_id: str,
         run_id: str,
         map_index: int = -1,
+        mapped_length: int | None = None,

Review Comment:
   I think I'll have to get over it - cos even when mapped length is set we 
need to store the value in the xcom backend. 
   
   My brain isn't firing on all cylinders today, so do what you think is best.
   
   Perhaps not document it and prefix it with `_`?



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