object.getClass is still an error in annotation

scala> object O
defined object O

scala> classOf[O.type]
<console>:9: error: class type required but O.type found
               classOf[O.type]
                        ^

It is broken. Therefore

scala> :paste
// Entering paste mode (ctrl-D to finish)

@pickling.directSubclasses(Array(classOf[O1.type]))
sealed abstract class C(val a: Int)
object O1 extends C(1)

// Exiting paste mode, now interpreting.

<console>:7: error: class type required but O1.type found
        @pickling.directSubclasses(Array(classOf[O1.type]))
                                                   ^

is also broken. There is another thing broken:

scala> :paste
// Entering paste mode (ctrl-D to finish)

@pickling.directSubclasses(Array(O1T))
sealed abstract class C(val a: Int)
object O1 extends C(1)
final val O1T = O1.getClass

// Exiting paste mode, now interpreting.

<console>:7: error: annotation argument needs to be a constant; found: 
this.O1T
        @pickling.directSubclasses(Array(O1T))
                                         ^

One workaround is:

scala> :paste
// Entering paste mode (ctrl-D to finish)

@pickling.directSubclasses(Array(classOf[O1]))
sealed abstract class C(val a: Int)
case class O1() extends C(1)

// Exiting paste mode, now interpreting.

defined class C
defined class O1

Not that awesome. Does anyone know another workaround? I don't even ask 
if anyone has the time to fix these - I don't know - 10 year old bugs 
(one ticket is https://issues.scala-lang.org/browse/SI-2453).

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