title: React Antd v4 autocomplete shows selected value instead of label upon selecting an option
body: <p>I am using React Antd v3 &amp; upgrading it to v4, I noticed one issue, where the Autocomplete component was changed &amp; now it is behaving in a weird manner</p>
  
  <p>Passing a json array of <code>[{value: string, label: 123}]</code>, everything works well except that on value selection, the value is shown (not the label)</p>
  
  <p>How to show the label instead &amp; keep the value selected as the option value?</p>
  
  <p><a href="https://codesandbox.io/s/why-shown-value-is-number-not-string-3lq2e" rel="noreferrer">Here is a link that shows the problem in a sandbox</a></p>
  
  <p><a href="https://codesandbox.io/s/autocomplete-with-options-still-renders-number-not-label-rddeb" rel="noreferrer">Another link where passing array of Options also doesn't work correctly</a></p>
  
  <p>Note:</p>
  
  <p>It was working well in Ant v3, <a href="https://codesandbox.io/s/antd-v3-autocomplete-works-well-swtkg" rel="noreferrer">as shown in this link</a></p>