Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/3442
Another thought from the discussion with @StefanRRichter :
You refactor a lot to not have duplicate code. While this is good in
general, I am wondering if we should not actually duplicate the code here,
because we want the `V1` serialization code and savepoint code to be
"immutable", meaning it should not be affected by changes to the `V2` code.
Having a copy makes sure no accidental changes are made to the `V1` code when
modifying the `V2` code.
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