title: Why does List<T> implement IReadOnlyList<T> in .NET 4.5?
body: <p>Why does <code>List&lt;T&gt;</code> implement <code>IReadOnlyList&lt;T&gt;</code> in .NET 4.5?</p>
  
  <p><code>List&lt;T&gt;</code> isn't read only...</p>