public function endVisitBoolean(BooleanValueCommand $x, Context $ctx)
 {
     if ($x->getValue()) {
         $this->one();
     } else {
         $this->zero();
     }
 }
 public function endVisitBoolean(BooleanValueCommand $x, Context $ctx)
 {
     $this->appendTypedData(BOOLEAN_TYPE, $x->getValue() ? "1" : "0");
 }