docs: public static <IN> CompletableFuture<IN> whenCompleteAsyncIfNotDone(
  		CompletableFuture<IN> completableFuture,
  		Executor executor,
  		BiConsumer<? super IN, ? super Throwable> whenCompleteFun) {
  		return completableFuture.isDone() ?
  			completableFuture.whenComplete(whenCompleteFun) :
  			completableFuture.whenCompleteAsync(whenCompleteFun, executor);
  	}