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<span class="label label-info" style="display: inline-block"><span class="glyphicon glyphicon-info-sign" aria-hidden="true"></span> Side Note </span>
when any Flink-managed state is used inside a
`KeyedProcessFunction`, the data returned by the `state.value()` call is
automatically scoped by the key of the *currently-processed event*
- see Figure 4. If `MapState` is used, the same principle applies, with
the difference that a `Map` is returned instead of `MyObject`. I