uranusjr opened a new pull request, #23860:
URL: https://github.com/apache/airflow/pull/23860

   This was done in `PythonOperator` to simplify the serialization format. But 
it turns out parsing out a correct format is too much work and too easy to get 
wrong, so let's not do that.
   
   Note that this does not affect decorated taskflow operators (which use 
`mapped_op_kwargs` instead), only plain classic `PythonOperator` subclasses.
   
   This change requires all mapped operators on classic `PythonOperators` 
subclasses to be re-serialized. But this is likely a reasonable tradeoff over 
carrying complex compatibility code forever.
   
   Fix #23833. Submitting as draft to catch all needed test changes first.


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