docs: def are_checksums_equal(checksum_a_pyxb, checksum_b_pyxb):
      """Determine if checksums are equal.
  
      Args:
         checksum_a_pyxb, checksum_b_pyxb: PyXB Checksum objects to compare.
  
      Returns:
        bool
          - **True**: The checksums contain the same hexadecimal values calculated with
            the same algorithm. Identical checksums guarantee (for all practical
            purposes) that the checksums were calculated from the same sequence of bytes.
          - **False**: The checksums were calculated with the same algorithm but the
            hexadecimal values are different.
  
      Raises:
        ValueError
          The checksums were calculated with different algorithms, hence cannot be
          compared.
  
      """
      if checksum_a_pyxb.algorithm != checksum_b_pyxb.algorithm:
          raise ValueError(
              'Cannot compare checksums calculated with different algorithms. '
              'a="{}" b="{}"'.format(checksum_a_pyxb.algorithm, checksum_b_pyxb.algorithm)
          )
      return checksum_a_pyxb.value().lower() == checksum_b_pyxb.value().lower()