public final char[] sub_chars(int offset, int count) {
        if (ASMUtils.IS_ANDROID && count < sbuf.length) {
            text.getChars(offset, offset + count, sbuf, 0);
            return sbuf;
        } else {
            char[] chars = new char[count];
            text.getChars(offset, offset + count, chars, 0);
            return chars;
        }
    }
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