Is your feature request related to a problem? Please describe.

To get this acme plugin working, I had to monkey-patch Puma::Binder#parse calls to add a hook system, so that a custom scheme (e.g. bind "acme://0.0.0.0:44333") would work with (hot-)reloading.

Describe the solution you'd like

A way of registering a new scheme with a callback so that the parse method could be extended to work with this plugin, without resorting to money-patches.

Describe alternatives you've considered

None that work well with the reloading & socket inheritance functionality.

Additional context

None.