E.g.
{{protocol}}{{domain}}/api/people/3c9b642a-6682-4b7a-aff2-1928371923719?fields[people]=role&include=role
This will not include any data and currently produces the same result as this query:
{{protocol}}{{domain}}/api/people/3c9b642a-6682-4b7a-aff2-1928371923719?fields[people]=role
Which means that there is no way currently to fetch a single entity and only receive some of its related data, which means GET entity requests will be exponentially slower – a ticking time-bomb in your app. Nice. Hard to believe no-one noticed this before.