ng-options comprehension_expression for simple array
<p>Very simple question, maybe I just don't get it:</p>

<p>This is my array in my angular MainController:</p>

<pre><code>vm.upcomingEventDates = [
    "2017-10-13",
    "2017-10-14",
    // [...]
];
</code></pre>

<p>And this is my select comprehension_expression:</p>

<pre><code>&lt;select ng-model="vm.booking.nextYearDate" ng-options="events as events for events in vm.upcomingEventDates"&gt;
</code></pre>

<p>But he keeps rendering it wrong (or not?):</p>

<pre><code>&lt;select ng-model="vm.booking.nextYearDate" ng-options="events as events for events in vm.upcomingEventDates" class="ng-pristine ng-untouched ng-valid"&gt;
    &lt;option value="?" selected="selected" label=""&gt;&lt;/option&gt;
    &lt;option value="0" label="2017-10-13"&gt;2017-10-13&lt;/option&gt;
    &lt;option value="1" label="2017-10-14"&gt;2017-10-14&lt;/option&gt;
    &lt;!-- [...] --&gt;
&lt;/select&gt;
</code></pre>

<p>How can I get rid of the first "wrong" value and get the date also in the value attribute?</p>