def METHOD_NAME(filename, outfile=sys.stdout, unnumbered=False):
    """
    For debugging: dump an XLS file's BIFF records in char & hex.
    :param filename: The path to the file to be dumped.
    :param outfile: An open file, to which the dump is written.
    :param unnumbered: If true, omit offsets (for meaningful diffs).
    """
    from .biffh import biff_dump
    bk = Book()
    bk.biff2_8_load(filename=filename, logfile=outfile, )
    biff_dump(bk.mem, bk.base, bk.stream_len, 0, outfile, unnumbered)