jedcunningham commented on a change in pull request #19034:
URL: https://github.com/apache/airflow/pull/19034#discussion_r730426761



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File path: airflow/models/param.py
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@@ -24,6 +24,16 @@
 from airflow.exceptions import AirflowException
 
 
+class NoValueSentinel:

Review comment:
       I was running into differing `id`'s with a naive `object()` sentinel, so 
I went with this class and used `isinstance` for comparison. Side benefit, 
allows for a better str/repr.




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