docs: public static <K, V> TreeMap<K, V> newTreeMap(Map<K, V> map, Comparator<? super K> comparator) {
  		final TreeMap<K, V> treeMap = new TreeMap<>(comparator);
  		if (false == isEmpty(map)) {
  			treeMap.putAll(map);
  		}
  		return treeMap;
  	}