docs: def _parse_version(version):
          """ Parse a version string.
  
          Args:
              version (str): A string representing a version e.g. '1.9rc2'
  
          Returns:
              tuple: major, minor, patch parts cast as integer and whether or not
                  it was a pre-release version.
          """
          parsed_version = parse_version(version)
          return tuple(
              int(dot_version)
              for dot_version in parsed_version.base_version.split('.')
          ) + (parsed_version.is_prerelease,)