code: public function set(TaxGroupInterface $taxGroup, CountryInterface $country, $business = false, array $taxes)
      {
          $key = $this->buildKey($taxGroup, $country, $business);
  
          $this->taxes[$key] = $taxes;
      }
docs: Caches the taxes for the given tax group, country and business flag.
  
  @param TaxGroupInterface $taxGroup
  @param CountryInterface  $country
  @param bool              $business
  @param array             $taxes