@Override
		public int compareTo(PairLabel o) {
			int srcCmp = Long.compare(srcLabel.longValue(), o.srcLabel.longValue());
			if (srcCmp != 0) {
				return srcCmp;
			}
			return Long.compare(destLabel.longValue(), o.destLabel.longValue());
		}
A neighborhood generator that, for a given function, generates all functions
in the same namespace.  For efficiency, it caches the namespace sets it generates.
Ghidra/Features/VersionTrackingBSim/src/main/java/ghidra/feature/vt/api/NamespaceNeighborhood.java