@alexpott, re #21 and #22, you're right. This seems a little unintuitive (esp...

@alexpott, re #21 and #22, you're right. This seems a little unintuitive (especially the fact that this happens twice in case of \Drupal\Core\Database\Statement) but it's required. The comment explains why and not having this resulted in the bugs I mentioned where routes with dynamic parameters wouldn't work.

Sidenote about that issue: It's weird that a PDO behaviour would cause impact to dynamic parameters in routes but this happens because a PDO exception is swallowed in \Drupal\Core\Routing\RouteProvider::getRoutesByPath.