Prevent Antlers / Statamic from escaping HTML attributes

I'm trying to render a navigation section of my site. And I would like to add the aria-current="page" attribute to the current item in the navigation.

<nav>
  {{ nav:main }}
    <a href="{{ url }}"{{ is_current || is_parent ?= ' aria-current="page"' }}>
      {{ title }}
    </a>
  {{ /nav:main }}
</nav>

But this is rendered with an escaped and invalid attribute.

<nav>
  <a href="/" aria-current=\"page>
    Home
  </a>
</nav>

How do I prevent Statamic from escaping this attribute?