code: public function setValue($value)
      {
          $this->value = $value;
  
          /** @noinspection NotOptimalIfConditionsInspection */
          if (is_array($value) && array_key_exists('start', $value) && array_key_exists('end', $value)) {
              $start = (float) $value['start'];
              $end   = (float) $value['end'];
  
              if ($start <= $end) {
                  $this->startElement->setValue($start);
                  $this->endElement->setValue($end);
              }
          }
  
          return $this;
      }
docs: Set the element value.
  
  @param mixed $value
  
  @return $this