Github user tzulitai commented on the issue:
https://github.com/apache/flink/pull/5950
@StefanRRichter yes, now that you mentioned it, the
`isSerializerPresenceRequiredFlag` does seem a bit awkward to be in the
serialization proxy. Essentially, what it is only doing is serving as a switch
to decide whether or not to fail - something that could be done by the caller.
I'll quickly try your suggested approach and see how that turns out.---
