title: Was the "interface" keyword removed from Dart?
body: <p>Just to be sure, has Dart removed explicitly defining an <code>interface</code> now in favor of implicitly defining it via <code>abstract</code>? </p>
  
  <p>I see it mentioned in <a href="https://stackoverflow.com/questions/20791286/dart-and-interface-segregation-principle">Dart and Interface Segregation Principle</a>, however I'm also finding a lot of content still referencing the explicit definition, such as <a href="https://stackoverflow.com/questions/10502649/when-to-use-interfaces-in-dart">When to use interfaces in Dart?</a> </p>