updateItemQuantity cart event callback executes before quantities are updated

I have an event that fires when the cart is updated. When reading the contents of the cart when the event is triggered, the quantities of the items within the cart show the values BEFORE the event was triggered.

I can't think of an instance where we would want to have the values of the quantities of items before the quantity change. We should be able to see the latest data within the cart when the updateItemQuantity event fires.

For further clarity I am referring to this event under the cart component:

      "events":{
        "updateItemQuantity":myFunction,
      },

If I then try to access quantities ( this.model.attrs.line_items[n].quantity ) I get the quantity from before the event fired

Start at the cart component's updateItemQuantity event callback and trace when the cart quantities become available relative to the callback. Done means reading this.model.attrs.line_items[n].quantity from the callback returns the updated quantity; verify the behavior with the project's relevant cart event tests if available.