low_name_only=True then value is set to None.
    Leading and trailing white space is striped from 'name' and 'value'.
    'name' can contain any printable characters.
    If the '=' delimiter character is allowed in  the 'name' then
    it must be escaped with a backslash and escape_delimiter must be True.
    If 'unquote' is True leading and trailing double-quotes are stripped from
    'name' and 'value'.
    If unique_values' is True then dictionary entries with the same value are
    removed before the parsed entry is added.z