Github user alopresto commented on the issue:
https://github.com/apache/nifi/pull/1238
I rebased against master and fixed the issue with `serialize...` I
described above. For posterity, the un-rebased branch with the same fixes is
still available [in my
repo](https://github.com/alopresto/nifi/tree/NIFI-3051-before-rebase).
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