title: Angular min and max validators for input[type='number']
body: <p>As I understand it (perhaps not well as I only started looking at this today) <a href="https://angular.io/api/forms/Validators#min" rel="nofollow noreferrer">there is are validators built in to Angular</a> that will check the max and min value of an <code>&lt;input type='number'&gt;</code>.<br>
  I tried to get this working in the app I'm building but it only comes up invalid when the input is completely empty. Other values validate, even numbers outside of my min/max range.  </p>
  
  <p><a href="https://plnkr.co/edit/heAsH7lKhtRX0zuiTBsH" rel="nofollow noreferrer">I tried to replicate it in a plunk but here it is just always valid</a>. I'm at the end of a long day - can anyone just explain what I have to do to make the field in my plunk be <strong><em>valid</em></strong> with values of 5-10 and <strong><em>invalid</em></strong> when outside this range, empty or otherwise just...invalid.</p>