So siehts ganz gut aus !

node_modules/es5-ext/test/object/is-natural-number.js

@@ -0,0 +1,12 @@
+"use strict";
+
+module.exports = function (t, a) {
+	a(t(undefined), false, "Undefined");
+	a(t(null), true, "Null");
+	a(t(2), true, "Number");
+	a(t(-2), false, "Negative");
+	a(t(2.34), false, "Float");
+	a(t("23"), true, "Numeric string");
+	a(t(NaN), false, "NaN");
+	a(t(Infinity), false, "Infinity");
+};