Which fields are nullable and which are required?

[sspenst]

The docs specify some fields as required and some nullable, but most have no annotation.

E.g. [artist(https://developer.spotify.com/documentation/web-api/reference/get-an-artist)

followers.href says nullable, so I assumed the unmarked fields were required. In reality, at least followers, genres and images have shown to be nullable. Which fields are actually required? Can I rely on name?

Artists is just an example, I'm wondering the same for all models.

Thanks a lot!