code: func DecodeAll(dst, src []uint64) (value int, err error) {
  	j := 0
  	for _, v := range src {
  		sel := v >> 60
  		if sel >= 16 {
  			return 0, fmt.Errorf("invalid selector value: %b", sel)
  		}
  		selector[sel].unpack(v, (*[240]uint64)(unsafe.Pointer(&dst[j])))
  		j += selector[sel].n
  	}
  	return j, nil
  }
docs: // Decode writes the uncompressed values from src to dst.  It returns the number
  // of values written or an error.