private void grow0(int minCapacity) {
        // minCapacity is usually close to size, so this is a win:
        bytes = Arrays.copyOf(bytes, newCapacity(minCapacity, bytes.length));
    }
A faster alternative that is functionally equivalent to Long.expand(i, 0x0F0F_0F0F_0F0F_0F0FL)
core/src/main/java/com/alibaba/fastjson2/JSONWriterUTF8.java