3.3.1 `typeof none_existent_identifier` evaluates to 'string' instead of 'undefined'

[Kafva]

Steps to reproduce

The typeof operator in jintr does not seem to work like it does in node / browser:

import { Jinter } from 'jintr';
const jinter = new Jinter();
jinter.evaluate('console.log(typeof none_existent_identifier)');
// => string

With node and in Firefox console I get:

> typeof none_existent_identifier
'undefined'

Failure Logs

string

Expected behavior

typeof non_existent_identifier returns 'undefined'

Current behavior

typeof non_existent_identifier returns 'string'

Version

Edge

Anything else?

No response

Checklist

• I am running the latest version.
• I checked the documentation and found no answer.
• I have searched the existing issues and made sure this is not a duplicate.
• I have provided sufficient information.