Github user greghogan commented on the issue:
https://github.com/apache/flink/pull/3382
@vasia, if you are available to review, I think the easiest way to do so is
to first review the classes for `LongValue` then compare the diff for
`IntValue` and `StringValue`. I think we are forced to duplicate code as the
value types to keep the method calls monomorphic.
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