Use Array.from with .values() in React iteration
Use Array.from with .values() in React iteration

I've also fixed and updated the codesandbox to the latest version of React, Mobx and Mobx-State-Tree.
mobxjs/mobx-state-tree,mweststrate/mobx-state-tree,mobxjs/mobx-state-tree,mobxjs/mobx-state-tree,mweststrate/mobx-state-tree,mobxjs/mobx-state-tree