如何在Scala中检查函数是否为部分函数？

val partialFunc: PartialFunction[Int, String] = {
  case 1 => "One"
  case 2 => "Two"
}

val totalFunc: Int => String = {
  case 3 => "Three"
  case _ => "Other"
}

println(partialFunc.isDefinedAt(1))  // 输出: true
println(partialFunc.isDefinedAt(3))  // 输出: false

println(totalFunc.isDefinedAt(1))    // 输出: true
println(totalFunc.isDefinedAt(3))    // 输出: true