Update terminology used in docs about exclusion options. Thanks to Paul Wise...

                        help='Treat absent files as empty')

    group3.add_argument('--exclude', dest='excludes',

                        metavar='GLOB_PATTERN', action='append', default=[],

                        help='Exclude/ignore files that match %(metavar)s')

                        help='Exclude files that match %(metavar)s. Use this '

                        'option to ignore files based on their names.')

    group3.add_argument('--exclude-command', dest='exclude_commands',

                        metavar='REGEX_PATTERN', action='append', default=[],

                        help='Exclude/ignore commands that match %(metavar)s. For '

                        "example, '^readelf.*\s--debug-dump=info' takes by far "

                        'the longest time, and differences here are probably '

                        'only secondary differences caused by something that '

                        'is already represented elsewhere in the diff.')

                        help='Exclude commands that match %(metavar)s. For '

                        "example '^readelf.*\s--debug-dump=info' can take a long "

                        'time and differences here are likely secondary '

                        'differences caused by something represented '

                        'elsewhere. Use this option to disable commands that '

                        'use a lot of resources.')

    group3.add_argument('--exclude-directory-metadata', '--no-exclude-directory-metadata',

                        action=BooleanAction, default=None,

                        help='Exclude/ignore directory metadata.  Useful if '

                        'comparing files whose filesystem-level metadata is not '

                        'intended to be distributed to other systems. For '

                        "example, this is true for most distros' package "

                        'builders, but not true for the output of commands like '

                        '`make install`. '

                        help='Exclude directory metadata. Useful if comparing '

                        'files whose filesystem-level metadata is not intended '

                        'to be distributed to other systems. This is true for '

                        'most distributions package builders, but not true '

                        'for the output of commands such as `make install`. '

                        'Metadata of archive members remain un-excluded. '

                        'Default: False if comparing two directories, else '

                        'True. Note that "file" metadata is actually a '

                        'property of its containing directory, and is not '

                        'relevant when distributing the file across systems.')

                        'Use this option to ignore permissions, timestamps, '

                        'xattrs etc. Default: False if comparing two ',

                        'directories, else True. Note that "file" metadata '

                        'actually a property of its containing directory, '

                        'and is not relevant when distributing the file across '

                        'systems.')

    group3.add_argument('--fuzzy-threshold', type=int,

                        help='Threshold for fuzzy-matching '

                        '(0 to disable, %(default)s is default, 400 is high fuzziness)',