title: why do other properties need nullability type specifier
body: <p>I am getting the date when a photo was created using</p>
  <pre><code>@property(nonatomic, readonly, nullable) AVMetadataItem *creationDate;
  </code></pre>
  <p>in my .h file.  Then I get the value of the AVMetadataItem of my video asset.</p>
  <p>This works fine however when I add this to my .h file all the rest of my properties get a warning that they are missing a nullability type specifier, even though they don't need it when I don't have this property listed.  How do I do this without having to add a nullablity specifier to every other property etc. in the .h file?</p>