Github user aljoscha commented on the issue:
https://github.com/apache/flink/pull/2533
@StephanEwen we can do that but then we won't have any sanity checks for
the `TypeSerializer` any more. Right now, even the RocksDB backed will
serializer the `TypeSerializer`/`StateDescriptor` with the checkpoint to verify
that the user only accesses it with the correct
`TypeSerializer`/`StateDescriptor`.
I would be in favor of completely getting rid of user code there, even if
it means losing those checks. Also, for this to work with the Heap backend we
need to either always keep state on the heap in serialized form or deserialize
lazily from restored serialized values using the `TypeSerializer` that we get
from the user when they access state for the first time.
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