core/src/main/java/com/alibaba/fastjson2/JSONWriterUTF16.java [620:666]:
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            switch (ch) {
                case '"':
                case '\'':
                    if (ch == quote) {
                        chars[off++] = '\\';
                    }
                    chars[off++] = ch;
                    break;
                case '\\':
                case '\r':
                case '\n':
                case '\b':
                case '\f':
                case '\t':
                    StringUtils.writeEscapedChar(chars, off, ch);
                    off += 2;
                    break;
                case 0:
                case 1:
                case 2:
                case 3:
                case 4:
                case 5:
                case 6:
                case 7:
                case 11:
                case 14:
                case 15:
                case 16:
                case 17:
                case 18:
                case 19:
                case 20:
                case 21:
                case 22:
                case 23:
                case 24:
                case 25:
                case 26:
                case 27:
                case 28:
                case 29:
                case 30:
                case 31:
                    StringUtils.writeU4Hex2(chars, off, ch);
                    off += 6;
                    break;
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core/src/main/java/com/alibaba/fastjson2/JSONWriterUTF16.java [815:861]:
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            switch (ch) {
                case '"':
                case '\'':
                    if (ch == quote) {
                        chars[off++] = '\\';
                    }
                    chars[off++] = ch;
                    break;
                case '\\':
                case '\r':
                case '\n':
                case '\b':
                case '\f':
                case '\t':
                    StringUtils.writeEscapedChar(chars, off, ch);
                    off += 2;
                    break;
                case 0:
                case 1:
                case 2:
                case 3:
                case 4:
                case 5:
                case 6:
                case 7:
                case 11:
                case 14:
                case 15:
                case 16:
                case 17:
                case 18:
                case 19:
                case 20:
                case 21:
                case 22:
                case 23:
                case 24:
                case 25:
                case 26:
                case 27:
                case 28:
                case 29:
                case 30:
                case 31:
                    StringUtils.writeU4Hex2(chars, off, ch);
                    off += 6;
                    break;
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