Made the code more robust.

Extended functionality with helper functions.

bin/example/arrays.php

@@ -0,0 +1,15 @@
+#!/usr/bin/php
+<?php
+
+use function Joop\Asynchronous\async;
+
+require_once __DIR__ . '/../../vendor/autoload.php';
+
+$promise = async(function () {
+	sleep(1);
+
+	return range(random_int(0, 10), random_int(20, 60));
+});
+
+$array = $promise->resolve()->getValue();
+var_dump($array);