Bugfixes
quickRdf\Dataset::key()add return type hint for PHP 8.1 compatibilityquickRdf\Dataset::delete()and ``quickRdf\Dataset::deleteExcept()` - fix a bug with internal quads pointer being interrupted by the in-place deletions.
quickRdf\Dataset::key() add return type hint for PHP 8.1 compatibilityquickRdf\Dataset::delete() and ``quickRdf\Dataset::deleteExcept()` - fix a bug with internal quads pointer being interrupted by the in-place deletions.