Phantom Types in Kotlin: Modelling a Pipeline: Request<Stage>

Request.kt

/*
* This is our Request type. It is basically a holder for all 
* information we could wish from it. But we cannot read anything from it directly. 
* It has a type param T.
* T is not used anywhere in Request directly, hence why it is called Phantom Type.
*/
class Request<T> (
  private val image: Image?, 
  private val timestamp: Timestamp?, 
  private val measureSettings: MeasureSettings?,
  private val preparedImage: Mat?, 
  private val scaledPreparedImage: Mat?,
  private val shapes: List<Shape>?, 
  private val features: List<Feature>?, 
  private val people: List<Person>?)