I am surprised it is licensed as GPLv3. That limits it to in-house projects unless you want to license any of your reusable code in a project as GPL to your cli

I am surprised it is licensed as GPLv3. That limits it to in-house projects unless you want to license any of your reusable code in a project as GPL to your clients. If you are looking for a routing library that works with 5.3, but also 5.1.6 and 5.2, I recommend checking out Moor (http://github.com/jeffturcotte/moor http://github.com/jeffturcotte/moor). It is licensed MIT so it can be used on any project.