title: React doesn't remap Array from state
body: <p>Basically we have list component, something like this:</p>
  
  <pre><code>{this.state.answers[0] ? this.state.answers.map(answer =&gt;
  &lt;li key={answer._id}&gt;{answer.text}&lt;/li&gt;) : null}
  </code></pre>
  
  <p>And when I update state component is re rendering but mapped list stay the same even when in <code>this.state</code> new, different data, list use old data. 
  Is that some kind of bug or what? Why list doesn't remap not after updating state not even after re rendering? </p>