alex-astronomer commented on pull request #18615:
URL: https://github.com/apache/airflow/pull/18615#issuecomment-936668630


   Passing a `List[k8s.V1EnvVar]` through XCOM will not work for the same 
reason, I can confirm @RickRen7575's point there.  Here's some more color 
around that:
   
   Even when passing an XCOM with the `render_template_as_native_obj` flag set 
to `True`, with the original code before these changes we would still be 
operating on that `List` before it gets rendered as the native object.  Not a 
heavy operation, of course, just checking that the type of the value passed is 
actually a `List`, but if we were to do this check from the initializer, it 
would still be a string at that point.


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