Angular 2 [hidden] does not seem to be working?

1

My component is defined this way:

import { Component } from 'angular2/core'

@Component({
    selector: 'sidebar',
    templateUrl: 'js/app/views/sidebar.html',
})
export class SidebarComponent {
    public sections: boolean[] = [
        true,
        false,
        false,
        false,
        false,
        false,
        false,
        false
    ];
}

The sidebar.html template:

<h3 class="proofTitle">...</h3>
<p [hidden]="sections[0]">
    ...
</p>
<p [hidden]="sections[1]">
    ...
</p>
...
<p [hidden]="sections[7]">
    ...
</p>

Seems pretty straight forward, but for some reason, it’s showing all of the sections… what am I missing?