@Override
	protected NavigableMap<K, WeakValueRef<K, V>> getRefMap() {
		return refMap;
	}
Constructs a new weak map with keys ordered according to the given comparator

@param comparator the comparator, or {@code null} for the natural ordering
Ghidra/Framework/Generic/src/main/java/ghidra/util/datastruct/WeakValueTreeMap.java