title: Why no AtomicBooleanFieldUpdater in java?
body: <p>There are <code>Atomic*FieldUpdater</code> classes in <code>java.util.concurrent.atomic</code> package, like:</p>
  <ul>
  <li><code>AtomicIntegerFieldUpdater</code></li>
  <li><code>AtomicLongFieldUpdater</code></li>
  <li><code>AtomicReferenceFieldUpdater</code> etc.</li>
  </ul>
  <p>But why no <code>AtomicBooleanFieldUpdater</code>?</p>