Why does composer.json contain `"include-path": ["vendor/tecnickcom"]`

As per extensions/cdntaxreceipts#110 (comment 47514) it seems to cause issues with extensions that try to use TCPDF in drupal 8 since composer creates a vendor/composer/include_paths.php file that then makes the path relative to /vendor/civicrm/civicrm-core, instead of relative to just /vendor.

Maybe the line was from an early iteration of autoloading and using composer?