v8/test/mjsunit/bugs/bug-223.js

// Copyright 2008 the V8 project authors. All rights reserved.
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// When calling user-defined functions on strings, booleans or
// numbers, we should create a wrapper object.

function TypeOfThis() { return typeof this; }

String.prototype.TypeOfThis = TypeOfThis;
Boolean.prototype.TypeOfThis = TypeOfThis;
Number.prototype.TypeOfThis = TypeOfThis;

assertEquals('object', 'xxx'.TypeOfThis());
assertEquals('object', true.TypeOfThis());
assertEquals('object', (42).TypeOfThis());