DOMContentLoaded is triggered with Turbolinks

With Turbolinks pages will change without a full reload, so you can’t
rely on DOMContentLoaded or jQuery.ready() to trigger your code. Instead
Turbolinks fires events on document to provide hooks into the lifecycle
of the page.

But I found DOMContentLoaded event is actually triggered when javascript
is placed at the bottom of body tag, so for example, DOMContentLoaded
will be triggered if I switch between pages using the following layout:

Turbolinks <%= stylesheet_link_tag 'application', media: 'all', 'data-turbolinks-track' => true %> <%= csrf_meta_tags %>
<%= yield %>
<%= javascript_include_tag 'application' %>

However, the DOMContentLoaded won’t be triggered if javascript is placed
in head tag. I read the source code of Turobolinks gem but I still don’t
understand why. Thanks!

Does Turbolinks still work, and make page loading faster, when you do
this?
I am about to try this, because I am having issues using sorttable.js
in
our app with TL turned on

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