Can I call `errorHandler.setUser()` before `errorHandler.start()`?

```js
const errorHandler = new StackdriverErrorReporter();
errorHandler.setUser('some_user_id');
errorHandler.start({ ...config, service: 'some_service_name' });
```
README says `setUser` can be called "at any time", but I just want to confirm, can I call it before `start()`?

In my code, I call `setUser()` when user id becomes available, and call `start()` when service name becomes available, and I can't guarantee their order.

Thanks!