Github user aljoscha commented on the issue:
https://github.com/apache/flink/pull/2768
In fact, my original suggestion was to add a new interface `ReadableState`:
```
interface ReadableState<T> {
T get();
}
```
and leave all the existing interfaces as they are. That way we would have
the least amount of changes in existing code and still have a common interface
for state that can be read. (Note that `ReadableState` does not extends `State`
on purpose, because of `State.clear()`.)
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