How do I prevent a form from being cached for anonymous users? I have a form that is pre-populated with information specific to an anonymous user's session information. However, the form appears to get cached for all anonymous users by default.
'Internal Dynamic Page Cache' is enabled, 'Internal Page Cache' is not.

How do I disable caching of this form? It should be rebuilt fresh every time it is displayed.
To update:

In order to prevent a form from caching at all, you can include the following #cache key in your form:

$form['#cache'] = ['max-age' =&gt; 0];