Deprecate restore($store)

[sergeysova]

Proposal

I know cases when restore is useful:

• saving payload from event with default value
• saving doneData from effect

But with store, looks like it is useless.

effector/src/effector/restore.ts

Line 8 in 2fcfdf7

if (is.store(obj)) return obj

In the source code it do nothing. And by semantics I think it can confuse with the definition of derived stores:

const $a = createStore('')
const $b = $a.map(s => s.length)

const $c = restore($b, 5)

1. What meaning of default value 5 here?
2. restore implies I want to create store by shorthand (not derived store), and here I can add .on
3. But in source code we do nothing
4. In the new major version derived stores cannot be used as targets Deprecate derived units in target #563, so target: restore($b) should throw an error, what is semantically wrong, because restore creates a New store

Use case

I don't see any case with restore($store).