forwardports ++spin/++spun api change
forwardports ++spin/++spun api change

adds documentation and typecasts

cgyarvin/arvo,ngzax/urbit,urbit/urbit,jfranklin9000/urbit,urbit/urbit,jfranklin9000/urbit,ngzax/urbit,ngzax/urbit,ngzax/urbit,jfranklin9000/urbit,cgyarvin/arvo,belisarius222/arvo,jfranklin9000/urbit,ngzax/urbit,urbit/urbit,jfranklin9000/urbit,ngzax/urbit,jfranklin9000/urbit,ohAitch/arvo,ohAitch/arvo,urbit/urbit,ngzax/urbit,urbit/urbit,urbit/urbit,joemfb/arvo,belisarius222/arvo,joemfb/arvo,urbit/urbit,jfranklin9000/urbit