title: React Native - ios - circle with border - circle background color spilling out of circle
body: <p>I'm trying to create a circle with a white background in react native and i'm having an issue where the background color of the circle is seen on the outline of the border. </p>
  
  <p>Check out this playground app:
  <a href="https://rnplay.org/apps/TsQ-CA" rel="noreferrer">https://rnplay.org/apps/TsQ-CA</a></p>
  
  <p>If you look closely you can see that around the circle there's a thin black line. It's like the border isn't covering the entire background.</p>
  
  <p>Here's the circle style:
  <code>
  circle: {
      borderRadius: 40,
      width: 80,
      height: 80,
      borderWidth: 5,
      borderColor: 'white',
      backgroundColor: 'black'
    }
  </code></p>
  
  <p>P.S. this only happens on iOS</p>
  
  <p>Any ideas??
  Thanks!</p>