Apply capitalization before delegating insertion:
trait CapitalisePlugIn extends Doc {
  abstract override def insert(x: Char, pos: Int): Unit = {
    super.insert(x.toUpper, pos)
  }
}
Scala's Char.toUpper implements the hinted conversion and leaves ordinary nonletters unchanged. The stackable trait modification intercepts insertion without changing the position, result type or deletion behavior.
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