title: New Ruby on Rails Setup : "Expected string default value for '--rc'; got false (boolean)"
body: <p>I'm setting up a Ruby on Rails web development environment on a new machine (macOS Sierra v. 10.12.1).  I'm following the setup instructions here: <a href="https://gorails.com/setup/osx/10.12-sierra">Setup Ruby On Rails on macOS 10.12 Sierra</a>.  When I check the newly installed rails version, I get the following:</p>
  
  <pre><code>$ rails --version
  Expected string default value for '--rc'; got false (boolean)
  Rails 4.2.6
  </code></pre>
  
  <p>I haven't seen that second line before, and googling hasn't yielded any helpful results.  Background information: clean install of macOS 10.12.1; installed xcode via the App Store; installed Homebrew via the instructions on <a href="http://brew.sh/">its homepage</a>; installing Ruby, Rails, etc. via the first link I mentioned.</p>
  
  <p>Anyone have any idea what might be going on?</p>