<p dir="auto">Not sure if this means I shouldn't use it, or if we just haven't documented it yet :)</p>
<p dir="auto"><a href="https://docs.flutter.io/flutter/widgets/Scrollable-class.html" rel="nofollow">https://docs.flutter.io/flutter/widgets/Scrollable-class.html</a></p>
<p dir="auto">I think we need some high level documentation of all the list and viewport classes, including a class hierarchy diagram showing inheritance, mixins, ownership, and who creates whom. It should probably lean on some other documentation explaining the purpose of custom Element subclasses, too.</p>