ouch.scala

package p

sealed trait Bar
final case object Oops extends Bar
final case class Foo(s: String) extends Bar

object Foo {
  def apply(x: Double): Bar     = if (x.isNaN) Oops else Foo("double")
  def apply(x: BigDecimal): Foo = Foo("BigDecimal")
}

object Main {
  val double2bigDecimal = null

  def main(args: Array[String]): Unit = {
    val x1      = Foo(1.1d)
    val x2: Foo = Foo(1.1d)
    println("x1: " + x1)
    println("x2: " + x2)
 }
 // x1: Foo(double)
 // x2: Foo(BigDecimal)
}