kennknowles commented on issue #21935:
URL: https://github.com/apache/beam/issues/21935#issuecomment-1287495686

   Ah, interesting. The reason for it is that a runner needs to be able to 
understand the format in order to handle the element for GBK and state 
operations, and is expected to output from GBK in a standard format. Is there a 
way to have the wrapper in the Java layer but move the check to the portability 
layer perhaps?


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