public final String stringVal() {
        if (!hasSpecial) {
            return this.subString(np + 1, sp);
        } else {
            return new String(sbuf, 0, sp);
        }
    }
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/JSONScanner.java