Why helpers are registered in 2 different ways in the following example?

Question

1. Handlebars.registerHelper
2. UI.registerHelper

https://github.com/meteor/localmarket/blob/master/client/helpers.js

Answer 1

Both of these approaches are deprecated. UI was deprecated in version 0.9.1. Handlebars was abandoned in favor of Spacebars in 0.8.0. From what I can tell, UI was a superclass of handlebars, before spacebars was announced.