public V get(Object key) {
    V rv = null;
    try {
      rv = client.get(getKey((String) key), transcoder);
    } catch (ClassCastException e) {
      // Most likely, this is because the key wasn't a String.
      // Either way, it's a no.
    }
    return rv;
  }
This method always returns false, as truth cannot be determined without
iteration.
src/main/java/net/spy/memcached/BaseCacheMap.java