I noticed the following:
When a kafka streams application starts, it will restore its state in its
state-stores (from the log-compacted kafka topic).  All good so far, but I
noticed that the 'deleted' entries are actually read in into the store as
'key' with value:`null`

Is this expected behaviour?  I would assume that 'null' values are ignored
when restoring the state as this is exactly how the entries are deleted on
the log-compacted kafka-topic.

When the compaction has run on the kafka topic, all is fine, but when the
segment is not compacted yet, these null values are read in.


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