To ensure the appropriate amount of information given the context of a request, digests are used to represent resources returned as part of another resource. For example, when retrieving users from the /users endpoint, the API returns the full User resource. However, when retrieving tasks from the /tasks endpoint, the assignee field returns a digest User, which contains only the user's ID, display name, and email address.
If you need more information than returned in a resource's digest, use the resource's id to retrieve the full representation from its endpoint. For example, you can use a task's assignee id to retrieve the full User resource from the /users endpoint.