More benchmarks and examples.

scripts/for2.rhai

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+const MAX = 1_000_000;
+
+print("Iterating an array with " + MAX + " items...");
+
+print("Ready... Go!");
+
+let now = timestamp();
+
+let list = [];
+
+for i in range(0, MAX) {
+    list.push(i);
+}
+
+let sum = 0;
+
+for i in list {
+    sum += i;
+}
+
+print("Sum = " + sum);
+print("Finished. Run time = " + now.elapsed + " seconds.");