title: How to tell typescript that an inputs event.currentTarget.value us a number?
body: <p>I have a <code>&lt;input type="number"&gt;</code>. How can I tell TypeScript this? As it is below, TypeScript thinks that event.currentTarget.value is a string.</p>
  
  <pre><code>private handleChange = (event: React.MouseEvent&lt;HTMLInputElement&gt;) =&gt; {
      this.props.onChange(event.currentTarget.value);
  };
  </code></pre>