ethereum: accept plain atoms for rlp encoding
ethereum: accept plain atoms for rlp encoding

It will measure them for you, making it easier to encode lists
containing both fixed- and variable-width numbers.

Largely obviates the need for +encode-atoms.

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