title: swift string diacriticInsensitive not working correct
body: <p>I am doing diacritic conversion on string. In Swedish it converts the letters åäö to aao. but iphone keyboard has åäö these letters. I couldn't understand why it converted these 3 letters. Is there an error in my code? Shouldn't the letters on the keyboard be converted?</p>
  <pre><code>print(&quot;åäö&quot;.folding(options: .diacriticInsensitive, locale: Locale(identifier: &quot;sv&quot;))) -&gt; output aao
  </code></pre>
  <p>my iphone keyboard:
  <a href="https://i.stack.imgur.com/8ojjQ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/8ojjQ.png" alt="enter image description here" /></a></p>