Dart SDK Spelling b, c, and d.

samples-dev/swarm/swarm_ui_lib/observable/ChangeEvent.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of observable;
 
 /** A change to an observable instance. */
 class ChangeEvent {
-  // TODO(sigmund): capture language issues around enums & create a cannonical
+  // TODO(sigmund): capture language issues around enums & create a canonical
   // Dart enum design.
   /** Type denoting an in-place update event. */
   static const UPDATE = 0;
 
   /** Type denoting an insertion event. */
   static const INSERT = 1;
 
   /** Type denoting a single-remove event. */
   static const REMOVE = 2;
 
@@ skipping 64 matching lines @@
         for (final listener in obj.listeners) {
           listener(this);
         }
       }
     }
   }
 }
 
 /** A listener of change events. */
 typedef void ChangeListener(EventSummary events);