private byte[] grow1(int off) {
        byte[] bytes = this.bytes;
        if (off == bytes.length) {
            bytes = grow(off + 1);
        }
        return bytes;
    }
A faster alternative that is functionally equivalent to Long.expand(i, 0x0F0F_0F0F_0F0F_0F0FL)
core/src/main/java/com/alibaba/fastjson2/JSONWriterUTF8.java