uppercase

fun <D> ReadOnlyProperty<D, String>.uppercase(): ReadOnlyProperty<D, String>
fun <D> ReadWriteProperty<D, String>.uppercase(): ReadWriteProperty<D, String>
fun <D> ReadOnlyProperty<D, String?>.uppercase(): ReadOnlyProperty<D, String?>
fun <D> ReadWriteProperty<D, String?>.uppercase(): ReadWriteProperty<D, String?>