upstream property
Upstream/License credit the third-party work an entry was published from: the difference between "this org built it" and "somebody else built it and we are showing it to you". WHO built it is Org, above — the account that paid for the project. There was once a separate admin-gated official boolean here claiming the same thing, and because it was gated it disagreed: apps Hanzo wrote and hosts were published by a script holding an ordinary org token, so it stayed false on all of them and this directory filed our own work as somebody else's. A field that restates an unforgeable fact can only ever be the wrong copy of it.
Please note: This property should have been non-nullable! Since the specification file does not include a default value (using the "default:" property), however, the generated source code must fall back to having a nullable type. Consider adding a "default:" property in the specification file to hide this note.
Implementation
String? upstream;