code: def _uint2objs(ftype, num, length=None):
      
      if num == 0:
          objs = [ftype.box(0)]
      else:
          _num = num
          objs = list()
          while _num != 0:
              objs.append(ftype.box(_num & 1))
              _num >>= 1
  
      if length:
          if length < len(objs):
              fstr = "overflow: num = {} requires length >= {}, got length = {}"
              raise ValueError(fstr.format(num, len(objs), length))
          else:
              while len(objs) < length:
                  objs.append(ftype.box(0))
  
      return objs
docs: Convert an unsigned integer to a list of constant expressions.