// stream of numBits sized ints to bytes, numBits<8
fcn toBytes(n,[(numBits,acc,bitsSoFar)]state){
   acc=acc.shiftLeft(numBits) + n; bitsSoFar+=numBits;
   reg r;
   if(bitsSoFar>=8){
      bitsSoFar-=8;
      r=acc.shiftRight(bitsSoFar);
      acc=acc.bitAnd((-1).shiftLeft(bitsSoFar).bitNot());
   }
   else r=Void.Skip;  // need more bits to make a byte
   state.clear(numBits,acc,bitsSoFar);
   r
}