How to use the ijson.common.number function in ijson

yield ('null', None)
        elif symbol == 'true':
            yield ('boolean', True)
        elif symbol == 'false':
            yield ('boolean', False)
        elif symbol == '[':
            for event in parse_array(lexer):
                yield event
        elif symbol == '{':
            for event in parse_object(lexer):
                yield event
        elif symbol[0] == '"':
            yield ('string', unescape(symbol[1:-1]))
        else:
            try:
                yield ('number', common.number(symbol))
            except decimal.InvalidOperation:
                raise UnexpectedSymbol(symbol, pos)
    except StopIteration:
        raise common.IncompleteJSONError('Incomplete JSON data')