u3: optimizes +stir jet, reducing incremental allocations in fold
u3: optimizes +stir jet, reducing incremental allocations in fold

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