Github user StephanEwen commented on the pull request:
https://github.com/apache/flink/pull/306#issuecomment-69965915
I think this is fine to merge.
FYI: I sometimes repeat the `Serializable` interface in the list of
superinterfaces (even when redundant) as a form of documentation. It makes it
clear upon reading the class signature that it is expected to be serializable.
So anyone extending the class is easier aware of that.
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