Github user aljoscha commented on the issue:

    https://github.com/apache/flink/pull/5185
  
    Thanks for the update. Regarding migration, I think the format that we 
write to the savepoint must be the same between the two `ListState` 
implementations.
    
    @StefanRRichter could you please have a look at this? And also 
@StephanEwen, I think you did a similar PoC implementation of this a while back.
    
    @je-ik It would make sense to change the title of the PR to reflect what 
this does now better.


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