docs: def bytes2iec(size, compact=False):
      """ Convert a size value in bytes to its equivalent in IEC notation.
  
          See `<http://physics.nist.gov/cuu/Units/binary.html>`_.
  
          Parameters:
              size (int): Number of bytes.
              compact (bool): If ``True``, the result contains no spaces.
  
          Return:
              String representation of ``size``.
  
          Raises:
              ValueError: Negative or out of bounds value for ``size``.
      """
      postfn = lambda text: text.replace(' ', '') if compact else text
      if size < 0:
          raise ValueError("Negative byte size value {}".format(size))
      if size < 1024:
          return postfn('{:4d} bytes'.format(size))
  
      scaled = size
      for iec_unit in IEC_UNITS[1:]:
          scaled /= 1024.0
          if scaled < 1024:
              return postfn('{:6.1f} {}'.format(scaled, iec_unit))
  
      raise ValueError("Byte size value {} out of bounds".format(size))