title: How to convert string in parent to proptype.number for React child component?
body: <p>I am sending <code>latitude</code> and <code>longitude</code>:</p>
  
  <pre><code>&lt;ListItem
     title="Endereço"
     rightTitle={location ? location : '-'}
     hideChevron
     onPress={() =&gt; this.props.navigation.navigate('Maps', {latitude: latitude, longitude: longitude})}
   /&gt;
  </code></pre>
  
  <p>This sends ok, but the child component is waiting for a <code>proptype.number</code> while my parent is sending a string type.</p>
  
  <p>How do I convert my props <code>latitude</code> and <code>longitude</code> to numbers?</p>