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Improve simple pointer protocol state query #43
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The associated test used to print an error on every run because the Status::NotReady output was incorrectly interpreted as an error. In the context of this function, it means that the pointer state has not changed since the last query, which is normal.
Since this output is not really an error, I think it is better modeled by returning an optional pointer status, so I changed that in simple pointer protocol interface.