Returns a variety of information about a single user specified by the requested ID.

public func getUser(_ userId: User.ID,
                      fields: Set<User.Field> = [],
                      expansions: [User.Expansions] = []
  )

Equivalent to GET /2/users/:id.

• userId: The ID of the user to lookup.
• fields: Any additional fields to include on returned objects
• expansions: Objects and their corresponding fields that should be expanded in the includes property

A Twitter API response object containing the User and any pinned tweets