leaky.js

var MyView = Ribcage.View.extend({
  afterInit: function (opts) {
    this.action = opts.action;
  }
, beforeRender: function () {
    this.button = new ButtonView({
      action: this.action
    });
  }
, afterRender: function () {
    this.appendSubView(this.button, this.$('.here'));
  }
, beforeClose: function () {
    delete this.button;
  }
, template: function () {
    return '<div class="here"></div>'
  }
});

var aView = new MyView({action: function () {
  console.log('I was made in a parent closure');
}});

document.body.appendChild(aView.el);

aView.render();
aView.render();

aView = null;

// You have now leaked aView and all its DOM nodes
// because two buttons were leaked in the three calls to render
// (one hidden call to render in the initializer)
// jQuery is still hanging on to the two buttons in its cache
// wat.