We have a retrier wanting to call a function, retrying on
IllegalStateExceptions (thrown by checkState()).
However, one of the checkStates is called inside a Concurrent.transform, so
when the checkState fails, the resulting IllegalStateException is wrapped in an
UncheckedExecutionException and isn't caught by the retrier.
We unwrap the IllegalStateException to make sure it's caught.
Q: Why not just catch UncheckedExecution exception?
A: Because it might wrap a different exception which we don't want to retry on.
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