title: Ruby 3.0.0 throwing NameError (uninitialized constant Boolean)
body: <p>Literally, this is showing up in <code>irb</code> and in my application code. Suddenly ruby 3.0.0 is no longer recognizing Boolean</p>
  <p>This worked a few weeks ago, it must have appeared after an OS update</p>
  <pre><code>$ irb
  3.0.0 :001 &gt; String
   =&gt; String 
  3.0.0 :002 &gt; Boolean
  Traceback (most recent call last):
          4: from /Users/aronlilland/.rvm/rubies/ruby-3.0.0/bin/irb:23:in `&lt;main&gt;'
          3: from /Users/aronlilland/.rvm/rubies/ruby-3.0.0/bin/irb:23:in `load'
          2: from /Users/aronlilland/.rvm/rubies/ruby-3.0.0/lib/ruby/gems/3.0.0/gems/irb-1.3.0/exe/irb:11:in `&lt;top (required)&gt;'
          1: from (irb):2:in `&lt;main&gt;'
  NameError (uninitialized constant Boolean)
  </code></pre>
  <h3>env</h3>
  <ul>
  <li>ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [x86_64-darwin21]</li>
  <li>rvm 1.29.12 (latest) by Michal Papis, Piotr Kuczynski, Wayne E. Seguin [https://rvm.io]</li>
  <li>MacOS 12.5.1 (2.4 GHz 8-Core Intel Core i9 processor)</li>
  </ul>
  <hr />
  <h3>Troubleshooting steps already taken:</h3>
  <ul>
  <li>uninstalled and reinstalled using RVM <code>rvm uninstall 3.0.0</code> then <code>rvm install 3.0.0</code></li>
  </ul>