So siehts ganz gut aus !

node_modules/es5-ext/object/ensure-finite-number.js

@@ -0,0 +1,9 @@
+"use strict";
+
+var isFiniteNumber = require("./is-finite-number")
+  , safeToString   = require("../safe-to-string");
+
+module.exports = function (value) {
+	if (isFiniteNumber(value)) return Number(value);
+	throw new TypeError(safeToString(value) + " does not represent a finite number value");
+};