[Q] Rack compatible HttpRouter#call takes a block

... but I'm unable to follow the code to where its used (or why its there). recognize seems to do the same as well.

In both cases, when a block is passed, the call ends up returning a HttpRouter::Request instead (which is not a valid rack response).

Any help on this would be appreciated. I'd be willing to help patch this if needed (if this is not intended behavior). Of course, its likely that I'm just missing something.

tagging @joshbuddy

also, the docs mention that the #call method can take both env or ``Rack::Request`. In my code, I've found the latter to not work.