--- /dev/null
+var classof = require('../internals/classof-raw');
+
+// `thisNumberValue` abstract operation
+// https://tc39.github.io/ecma262/#sec-thisnumbervalue
+module.exports = function (value) {
+ if (typeof value != 'number' && classof(value) != 'Number') {
+ throw TypeError('Incorrect invocation');
+ }
+ return +value;
+};