[unbound-method] problem detected using typeof of method

[andsouto]

Repro

{
  "rules": {
    "@typescript-eslint/unbound-method": ["error"]
  }
}

typeof Number.isInteger === 'function';

Expected Result
No error is detected.

Actual Result
The next error is shown:

Avoid referencing unbound methods which may cause unintentional scoping of `this` @typescript-eslint/unbound-method

Additional Info
If the method is not run I can't see how the this can get an unexpected value.

I've seem tslint has an allow-typeof option to allow this use case. However, if I'm not missing something the ideal behaviour will be only applying the rule when the method is run instead of adding that kind of options.

Versions

package	version
@typescript-eslint/eslint-plugin	1.11.0
@typescript-eslint/parser	1.11.0
TypeScript	3.5.3
ESLint	5.16.0
node	8.16.0
npm	6.10.0