Multiple ordered with array fails

#### How can we help?

This value `['first item', 1, 2, 3, 'last item']` for the following schema fails but it should pass. The schema requires 'first item' followed by 1 or more numbers, ending with 'last item'.

```js
Joi.array()
.ordered(Joi.valid('first item'))
.items(Joi.number())
.ordered(Joi.valid('last item'))
```