class ProcessTrace {
  
  const P_traceOrigin = [
    IsType::Null,
    IsType::Array,
    [IsType::Object, \Throwable::class],
    [IsType::Object, ProcessTrace::class]
  ];
  
  //...

  /**
   * ProcessTrace constructor
   * @param null|array|\Throwable|ProcessTrace $origin
   */
  public function __construct($origin = null) {
    $originType = 
      ParamGuard::whichOf($origin, self::P_traceOrigin);
    
    switch ($originType) {
      case IsType::Null: //...
      case IsType::Array: //...
      case \Throwable::class: //...
      case ProcessTrace::class: //...
      default: ParamGuard::fallthrough($originType);
    }
    
    //...