title: IRB doesn't respect dot (.) as a word-break character
body: <p>I'm using irb on OS X, and when I press option left/right (or META+B/F) the cursor moves to the next/previous word. But irb doesn't wont to treat dot (.) character as a word separator.</p>
  
  <p>I've tried to add the (.) to the .irbrc, so it looks like this now:</p>
  
  <pre><code>Readline.basic_word_break_characters = " \t\n`&gt;&lt;=.;|&amp;{("
  </code></pre>
  
  <p>But that has no effect.</p>
  
  <p>I'm using the stock Mountain Lion ruby, and a manually compiled 1.9.3, both versions of irb behave similar. Also dot is treated as a separator in bash and in pry, so the system wide settings are probably fine.</p>
  
  <p>Any help appreciated,</p>
  
  <p>Thanks</p>