title: set array of data into mobx array show proxy objects
body: <p>I'm using react js with mobx and I get data from api.
  the data I get is array of objects.
  when I set the data into mobx variable then I see array of proxy objects(not sure what the proxy says). I'm trying just to set the array of objects I get from api into mobx variable.</p>
  
  <p>my store</p>
  
  <pre><code>class UserStore {
  @persist @observable token = null
  @observable tasks = []
  @observable done = false
  
  @persist @observable email = ''
  
  constructor() {
  
  }
  @action
  getTasks = async () =&gt; {
      try {
          let response = await Api.getTasks()
          console.log('getTasks',response.tasks)
          this.tasks = response.tasks
          console.log('my new tasks',this.tasks)
  
      } catch (e) {
          console.log(e)
      }
  }
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/tCwfr.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/tCwfr.jpg" alt="enter image description here"></a></p>
  
  <p>as you can see here in the first block('black') the data i get from api, then i set the respnse.tasks into this.tasks.</p>
  
  <pre><code> this.tasks = response.tasks
    console.log('my new tasks',this.tasks)
  </code></pre>