`in` operator not working correctly when using Proxy as VM context

<!-- Thank you for reporting a possible bug in Node.js. Please fill in as much of the template below as you can. Version: output of `node -v` Platform: output of `uname -a` (UNIX), or version and 32 or 64-bit (Windows) Subsystem: if known, please specify the affected core module name If possible, please provide code that demonstrates the problem, keeping it as simple and free of external dependencies as you can. --> * **Version**: v12.13.1 * **Platform**: Windows 10 <!-- Please provide more details below this comment. --> The `in` operator does not work correctly when using a Proxy as a VM context. ```js var o = {}; var p = new Proxy(o, { has(target, key) { console.log('has', key); return Reflect.has(target, key); }, get(target, key, receiver) { console.log('get', key); return Reflect.get(target, key, receiver); }, }); vm.createContext(p); vm.runInContext(`this.abcInThis = 'abc' in this`, p); console.log(JSON.stringify(o)); // Prints {"abcInThis":false} ``` In the above code, the expected output is: ``` has abc {"abcInThis":false} ``` but the actual output is: ``` get abc {"abcInThis":true} ``` If we remove the `get(target, key, receiver)` function, the still incorrect output is: ``` {"abcInThis":false} ```