Circe + Shapeless: blacklist fields with type-safety

circe_shapeless_record.scala

import shapeless._, record._
import io.circe._
import io.circe.syntax._
import io.circe.generic.encoding._

case class Person(name: String, age: Int)

object Person {
  implicit val encodePerson: Encoder[Person] =
    ReprObjectEncoder.deriveReprObjectEncoder.contramap { person =>
      LabelledGeneric[Person].to(person) - 'age
    }
}