StoreMixin: Seems impossible to handle an error without Storemixin throwing it in any case

We're using static function in stores to trigger xhr calls - as far as i can see they are defined correctly. However it seems impossible to avoid that the Storemixin itself throws an error. As far as i understand the alt-source the following line will always be triggered if an xhr error occurs:
https://github.com/goatslacker/alt/blob/9d228dce2295890cb9a0ea114bd5840a128ba55d/src/alt/store/StoreMixin.js#L57

Is this the desired behaviour? I mean to pass in a truthy value in any case?
https://github.com/goatslacker/alt/blob/9d228dce2295890cb9a0ea114bd5840a128ba55d/src/alt/store/StoreMixin.js#L70

**\* Sample Code for an XHR Handler ***

```
const DesignSource = (alt) => {
return {
rate: {
remote(state, rating, designId) {
return api.post('designs/' + designId + '/rate', {
rating: rating
});
},
success: alt.getActions(designs').addRating,
error: alt.getActions('designs').xhrError
}
};
};
```

Start in src/alt/store/StoreMixin.js at the referenced lines 57 and 70, then trace the sample DesignSource XHR error path. Reproduce whether StoreMixin always throws despite the configured error handler and determine the intended error-propagation behavior; done means that behavior is clarified and the issue's concern is resolved.

Written by the indexing model from the issue text.