title: Requiring 'bundler' or 'bundler/setup'?
body: <p>What's the difference between requiring either of these 2? Will <code>require bundler</code> give me any additional functionality that <code>bundler/setup</code> won't? I've seen someone asking a <a href="https://stackoverflow.com/questions/42294482/difference-between-require-bundler-and-require-bundler-setup">similar question</a> but the answer was extremely generic, like what does <code>require gem</code> vs <code>require gem/file</code> is, not necessarily in Bundler context.</p>