Select multiple not work

`{!! Form::select('available_languages', __('Available languages'), $availableLanguagesCollection)->multiple() }}
`
render for me:
```
<select name="available_languages" id="inp-available_languages" multiple="" class="form-control">
<option value="en">English</option>
<option value="ru">Russian</option>
</select>
```

why not available_languages[] ?
i want array in my action controller