naruto-lgtm commented on PR #68662:
URL: https://github.com/apache/airflow/pull/68662#issuecomment-4882650005

   Pushed the removal in eef021eb.
   
   I went with removing it outright rather than reintroducing a narrow 
allowlist. From the call-site sweep, once the cross-boundary control-flow 
signals are accounted for (they already travel as their own comms messages and 
get reconstructed explicitly in the task runner), nothing in the runtime 
depends on getting an exception instance back out of general serialization. So 
the AIRFLOW_EXC_SER/BASE_EXC_SER branches were only ever catching exceptions 
nested inside some other serialized value, which is exactly the general-case 
behaviour you wanted gone from a module that runs in so many processes.
   
   What changed:
   
   - Dropped both encode branches (the AirflowException-with-serialize one and 
the KeyError/AttributeError one) and the matching decode branch. No process 
running general serialization can import-and-call a payload name anymore; an 
exception now just serializes to its string form via the existing fallback.
   - Removed the two now-dead DagAttributeTypes members.
   - One thing the removal surfaced: the guard test 
(test_recursive_serialize_calls_must_forward_kwargs) was short-circuiting on 
the var.serialize() call in the exception branch, which had been masking a 
cls.serialize(list(var)) recursion for LazySelectSequence that dropped strict. 
I forwarded strict there so the invariant actually holds now.
   
   I didn't add the allowlisted helper since I couldn't find a case that needs 
one. If you know of a round-trip I've missed, point me at it and I'll add the 
targeted map, but my read is nothing outside the comms path relies on it.


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