code: def int_to_bitlist(x: int, pad: int = None) -> Sequence[int]:
      
      if pad is None:
          form = '{:0b}'
      else:
          form = '{:0' + str(pad) + 'b}'
  
      return [int(b) for b in form.format(x)]
docs: Converts an integer to a binary sequence of bits.
  
      Pad prepends with sufficient zeros to ensures that the returned list
      contains at least this number of bits.
  
      >>> from quantumflow.utils import int_to_bitlist
      >>> int_to_bitlist(4, 4))
      [0, 1, 0, 0]