public long getValue(KeyedObject o) throws NoValueException {
		return values.get(o.key());
	}
Return the value associated to the specified KeyedObject.
@throws NoValueException if the value has not been set or 
the KeyedObject does not belong to the owningSet.
Ghidra/Framework/Generic/src/main/java/ghidra/util/graph/attributes/LongAttribute.java