Rivetsjs adapter for backbonejs

backbone-rivets.config.js

rivets.configure({
  adapter: {
    subscribe: function(obj, keypath, callback) {
      if (obj instanceof Backbone.Collection) {
        obj.on('add remove reset', function () { 
          callback(obj[keypath]) 
        });
      } else {
        obj.on('change:' + keypath, function (m, v) { callback(v) });
      };
    },
    unsubscribe: function(obj, keypath, callback) {
      if (obj instanceof Backbone.Collection) {
        obj.off('add remove reset', function () { 
          callback(obj[keypath]) 
        });
      } else {
        obj.off('change:' + keypath, function (m, v) { callback(v) });
      };
    },
    read: function(obj, keypath) {
      if (obj instanceof Backbone.Collection) {
        return obj[keypath];
      } else {
        return obj.get(keypath);
      };
    },
    publish: function(obj, keypath, value) {
      if (obj instanceof Backbone.Collection) {
        obj[keypath] = value;
      } else {
        obj.set(keypath, value);
      };
    }
  }
});

Not sure if obj.off will unbind the callback (line 18), since the second parameter is a newly created function, not the same from line 9.