title: Would it be beneficial to begin using instancetype instead of id?
body: <p>Clang adds a keyword <a href="http://clang.llvm.org/docs/LanguageExtensions.html#objc_instancetype"><code>instancetype</code></a> that, as far as I can see, replaces <code>id</code> as a return type in <code>-alloc</code> and <code>init</code>. </p>
  
  <p>Is there a benefit to using <code>instancetype</code> instead of <code>id</code>?</p>