When observe() a MST node's primitive property, TypeScript get the wrong type of oldValue & newValue

[songzhenqi]

TypeScript infer the oldValue & newValue to string while actually a ScalarNode with storedValue.

code ：

import { observe } from "mobx"
import { types } from "mobx-state-tree"

const Model = types
    .model('Model', {
        name: types.string,
    })
    .actions((self) => ({
        setName(newName: string) {
            self.name = newName
        },
    }))

const model = Model.create({
    name: "John",
})

observe(model, 'name', (change) => {
    if (change.type === 'update') {
        console.log(`observe storedValue, ${change.oldValue?.storedValue}, ${change.newValue?.storedValue}`)
        console.log(`observe, ${change.oldValue}, ${change.newValue}`)
    }
})

model.setName("Dave");

[songzhenqi]

have shift this to an Issue, see:#2105