I changed it to false at sha: 826197be3b092a3fe46e554d4eaad9e2cecdd6aa. The reason is that even though the implementation (i.e. the class in Symfony that calls `matches` and uses its value) allows for a "falsey" value, the `RequestMatcherInterface::matches` states that this method returns a boolean.

Obviously, small detail - but I wanted to explain why I chose to change it :).

Thanks!