I looked into this recently, and this is the implementation I ended up choosing: https://github.com/mapbox/variant https://github.com/mapbox/variant It has a

I looked into this recently, and this is the implementation I ended up choosing: https://github.com/mapbox/variant https://github.com/mapbox/variant It has a very handy "match" method that addresses the issue raised in this blog post. They've also compiled many links to other variant implementations, as well as a bibliography on the standardisation efforts: https://github.com/mapbox/variant/blob/master/doc/other_implementations.md https://github.com/mapbox/variant/blob/master/doc/other_impl... https://github.com/mapbox/variant/blob/master/doc/standards_effort.md https://github.com/mapbox/variant/blob/master/doc/standards_...