kennknowles commented on issue #18121:
URL: https://github.com/apache/beam/issues/18121#issuecomment-1526026106

   Basically if we did add this feature, it would be pretty much the same as a 
user making a copy of the element right away in their mutating DoFn. In some 
cases if we knew that the element would not be re-used we could save that cost.


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