docs: @SafeVarargs
  	private final List<BaseInvoker> union(List<BaseInvoker>... theInvokersLists) {
  		List<BaseInvoker> haveOne = null;
  		boolean haveMultiple = false;
  		for (List<BaseInvoker> nextInvokerList : theInvokersLists) {
  			if (nextInvokerList == null || nextInvokerList.isEmpty()) {
  				continue;
  			}
  
  			if (haveOne == null) {
  				haveOne = nextInvokerList;
  			} else {
  				haveMultiple = true;
  			}
  		}
  
  		if (haveOne == null) {
  			return Collections.emptyList();
  		}
  
  		List<BaseInvoker> retVal;
  
  		if (haveMultiple == false) {
  
  			// The global list doesn't need to be sorted every time since it's sorted on
  			// insertion each time. Doing so is a waste of cycles..
  			if (haveOne == theInvokersLists[0]) {
  				retVal = haveOne;
  			} else {
  				retVal = new ArrayList<>(haveOne);
  				retVal.sort(Comparator.naturalOrder());
  			}
  
  		} else {
  
  			retVal = Arrays
  				.stream(theInvokersLists)
  				.filter(t -> t != null)
  				.flatMap(t -> t.stream())
  				.sorted()
  				.collect(Collectors.toList());
  
  		}
  
  		return retVal;
  	}