Since you are doing event delegation on `selector` it is correct to use `data.el`.
In fact the latter is `$(e.target).closest(selector)`.

Consider this markup
```html
<a class="foo"><span>yo</span></a>
```
and this js
```javascript
this.on('click', {
  linkSelector: this.doSomething
});
```
if you click yo.. `event.target`  would be the `span` rather then the `a.foo`.

That said we might argue that having `el` in `data` can be unsafe.
Maybe I would have added `el` to the `event` eg: `event._el`, `event._target` or something like that