public void close() {
        super.close();

        if (buf.length <= 1024 * 64) {
            BUF_LOCAL.set(buf);
        }
        this.buf = null;

        IOUtils.close(reader);
    }
The value of a literal token, recorded as a string. For integers, leading 0x and 'l' suffixes are suppressed.
src/main/java/com/alibaba/fastjson/parser/JSONReaderScanner.java