Miroslaw

> We leave cells empty until better timing. That is, doing [this ](https://jsfiddle.net/creatormir/sqnxt0c6/12/) is incorrect (not effective)? ``` deleter(); // create empty cell vanX.replace(items.arr, l => l); // for repair...

The place to cut. It helped me.  

I've come to see the serial connection. And about the SPI, I think the problem is the StepStick board. The SPI is blocked. We need to cut the track. That's...

In that case, it's strange that it's called `hydrate`. It's more correct to call it `replace` or `update`. The point of hydration is to not run rendering and bind reactivity...