title: React Native TextInput does not display number type value
body: <p>I have a pre-rendered value that always has to be a number type. I set the TextInput value to this number but it does not display in the input field unless I convert the number to a string. However, when the number is converted to a string  using <code>toString()</code> or <code>String(value)</code>, editing the TextInput by clearing out the field causes NaN to display in the field which becomes impossible to wipe out as it keeps recurring after every attempt.</p>
  <p>Here is how the TextInput looks:</p>
  <pre><code>&lt;TextInput value={5}/&gt; 
  //displays nothing in the field unless when like this: 
  
  &lt;TextInput value=&quot;5&quot;/&gt;
  
  &lt;TextInput value={value.toString()}/&gt;  and &lt;TextInput value={String(value}/&gt; cause NaN when the field is cleared completely
  
  </code></pre>
  <p>It also does not emit a number value, but not rendering a number value is the more serious problem.</p>
  <p>Please can anyone tell me how I can solve this?</p>