ur: refactors ur_bsw8 and ur_bsw_bytes internals
ur: refactors ur_bsw8 and ur_bsw_bytes internals

urbit/urbit,ngzax/urbit,ngzax/urbit,ngzax/urbit,urbit/urbit,ngzax/urbit,urbit/urbit,ngzax/urbit,ngzax/urbit,urbit/urbit,urbit/urbit,urbit/urbit,ngzax/urbit,urbit/urbit