Drastically simplify ##bignum.arithmetic-shift
Drastically simplify ##bignum.arithmetic-shift

acenode/gambit,acenode/gambit,jasperla/gambit,thewhimer/gambit,thewhimer/gambit,thewhimer/gambit,jasperla/gambit,jasperla/gambit,BeImprovised/gambit,thewhimer/gambit,thewhimer/gambit,BeImprovised/gambit,BeImprovised/gambit,thewhimer/gambit,acenode/gambit,acenode/gambit,BeImprovised/gambit,jasperla/gambit