code: protected function applyFix(\SplFileInfo $file, Tokens $tokens)
      {
          for ($index = 0, $count = $tokens->count(); $index < $count; ++$index) {
              if (!$tokens[$index]->isCast()) {
                  continue;
              }
  
              $tokens[$index] = new Token([$tokens[$index]->getId(), strtolower($tokens[$index]->getContent())]);
          }
      }
docs: {@inheritdoc}