RFC: `$kv.addItems`

[Kelin2025]

Case

Currently, if you want to add more items to KV, you have to call addItem X times or use addItemTree which isn't always the case 'cause you don't always have a tree-like structure

Due to the nature of sample, calling addItem X times happens in separate ticks which triggers X updates with halfway updated state

Solution

Like $kv.addItem, add $kv.addItems too

const addItems = $kv.addItems({ fn: (draft) => item })