public void putAll(Map<? extends String, ? extends V> t) {
    for (Map.Entry<? extends String, ? extends V> me : t.entrySet()) {
      client.set(getKey(me.getKey()), exp, me.getValue());
    }
  }
This method always returns false, as truth cannot be determined without
iteration.
src/main/java/net/spy/memcached/BaseCacheMap.java