@Override
    public final void writeName14Raw(long name0, long name1) {
        int off = this.off;
        int minCapacity = off + 19 + pretty * level;
        byte[] bytes = this.bytes;
        if (minCapacity > bytes.length) {
            bytes = grow(minCapacity);
        }
        if (startObject) {
            startObject = false;
        } else {
            bytes[off++] = ',';
            if (pretty != PRETTY_NON) {
                off = indent(bytes, off);
            }
        }

        UNSAFE.putLong(bytes, ARRAY_BYTE_BASE_OFFSET + off, name0);
        UNSAFE.putLong(bytes, ARRAY_BYTE_BASE_OFFSET + off + 8, name1);
        bytes[off + 16] = ':';
        this.off = off + 17;
    }
A faster alternative that is functionally equivalent to Long.expand(i, 0x0F0F_0F0F_0F0F_0F0FL)
core/src/main/java/com/alibaba/fastjson2/JSONWriterUTF8.java