title: is there a character limit for hash keys?
body: <p>The code below fails on repl.it and codeacademy labs, but when I choose a key length &lt; 8, it works. Neither key length fails in irb.</p>
  
  <p>Is this just a problem with the web REPLs, or is there a real limitation to the length of a key?</p>
  
  <pre><code>class Fixnum
  
      def in_words
          words =
          {
             100000000 =&gt; "trillion"
          }
          puts words[self]
      end
  
  end
  
  100000000.in_words
  </code></pre>