Wrong class tag for ClassTag[Unit]

[nicolasstucki]

object Foo {
  def main(args: Array[String]): Unit = {
    println(implicitly[reflect.ClassTag[Unit]])
    println(implicitly[reflect.ClassTag[Unit]].getClass)
  }
}

on Dotty prints

scala.runtime.BoxedUnit
class scala.reflect.ClassTag$GenericClassTag

and on scalac prints

Unit
class scala.reflect.ManifestFactory$$anon$14

[nicolasstucki]

We also do not encode correctly class tags for Any and AnyVal