anchor.diff:    // also copying the cache.
     static final Expando<_RegistryCache> _caches = Expando<_RegistryCache>();
   
  -  /// Port for sending command to the central registry manager.
  +  /// Port for sending commands to the central registry manager.
     final SendPort _commandPort;
   
     /// Create a registry linked to a [RegistryManager] through [commandPort].
  
positive.code: /// See [SendPort] for details on the restrictions on objects which can be sent
  /// between isolates.
  ///
  /// A registry can be sued to make a number of object available to separate
  /// workers in different isolates, for example ones created using
  /// [IsolateRunner], without sending all the objects to all the isolates.
  /// A worker can then request the data it needs, and it can add new data
  
negative.code: ///
  /// A [Registry] object caches objects found using the [lookup]
  /// method, or added using [add], and returns the same object every time
  /// it is requested.
  /// A different [Registry] object that works on the same underlying registry,
  /// will not preserve the identity of elements
  ///
  