knownValueMap = new HashMap<ValueNumber, IsNullValue>(((IsNullValueFrame)other).knownValueMap);
if (IsNullValueAnalysisFeatures.TRACK_KNOWN_VALUES) { knownValueMap = new HashMap<ValueNumber, IsNullValue>(((IsNullValueFrame)other).knownValueMap); }
	public void copyFrom(Frame<IsNullValue> other) {		super.copyFrom(other);		knownValueMap = new HashMap<ValueNumber, IsNullValue>(((IsNullValueFrame)other).knownValueMap);	}