[conaclos]

(1) Yes this makes interoperability hard. However, `typeof` is generally used to test the type of value. It is unlikely to pass its value to a function

If you use a function declared in a module with a distinct edition, you have to comply to its contract. And its contract certainly state that "null" is not a valid value to pass through.

Moreover, a type checker or linter could error/warn about this.

(2) You are right.

Another solution might be to introduce a new keyword:

  ```js
  use "edition2023"
  ```

Old browser could thus crash. In the same way that they did for ESM.