title: Can't enter Umlauts in Ruby 1.9.3 IRB
body: <p>I am experiencing very strange behavior in Ruby 1.9.3's IRB with Mac OS 10.7.3
  When I try to enter an Umlaut, it's escaped in the prompt and looks like this (I entered <code>"ü"</code> on the keyboard)</p>
  
  <pre><code>irb(main):001:0&gt; "\U+FFC3\U+FFBC"
  </code></pre>
  
  <p>What's super strange is this:</p>
  
  <pre><code>irb(main):001:0&gt; "\U+FFC3\U+FFBC".length
  =&gt; 0
  </code></pre>
  
  <p>Of course, the character isn't displayed either:</p>
  
  <pre><code>irb(main):001:0&gt; "\U+FFC3\U+FFBC"
  =&gt; ""
  </code></pre>
  
  <p>Does anyone know what's going on here or how to fix this?</p>