title: When does Spymemcached's MemcachedClient#delete return false?
body: <p>I'm using Spymemcached (2.10.0), and I would like to know when <code>MemcachedClient#delete(String key)</code> returns false.</p>
  
  <p>I already found <code>MemcachedClient#delete(String key)</code> fails and returns false when the specified key is not found, but I don't know whether it happens in any other situations.</p>
  
  <p>Reference document says nothing about the returned value...</p>
  
  <p><a href="http://dustin.sallings.org/java-memcached-client/apidocs/net/spy/memcached/MemcachedClient.html" rel="nofollow">http://dustin.sallings.org/java-memcached-client/apidocs/net/spy/memcached/MemcachedClient.html</a></p>
  
  <p>Thanks.</p>