title: Can I use "uppercaseString" in an app targeting 8.0? Is it safe pre iOS 8.3?
body: <p>I'm using the built in string method <code>uppercaseString</code>, like this:</p>
  
  <pre><code>let capitalLetters = myString.uppercaseString
  </code></pre>
  
  <p>The documentation tells this for availability: </p>
  
  <blockquote>
    <p>iOS (8.3 and later)</p>
  </blockquote>
  
  <p>However, Xcode is not giving a compiler error, with the <code>if #available</code> recommendation, i.e:</p>
  
  <pre><code>if #available(iOS 8.3, *) {
  
  } else {
  
  }
  </code></pre>
  
  <p>My question is simple. Can I use this method in an app targeting 8.0? I cannot test it on a device with this version because I don't have one. And the simulator I have is 8.4.</p>