abergmeier commented on pull request #14174:
URL: https://github.com/apache/beam/pull/14174#issuecomment-794482495


   > In Python we always infer the coder from the PCollection's element_type, 
which is determined from typehints. Often we just fall back to 
FastPrimitivesCoder.
   
   TBH infering/relying on (implicit) typehints sounds scary to me. Will give 
this a try and report back.
   
   > In your case it should be enough to just use typehints.KV.
   
   I hope they are correct now. For now I tried fully qualifying all typehints.
   
   > As discussed elsewhere, we generally just use python primitives rather 
than the CoGbk* util classes. Let me know if there are specific ones that don't 
seem to be supported in Python.
   
   Yes thanks, indeed for now it seems I got rid of all of these.


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