@Override
  public OperationFuture<CASValue<Object>> asyncGets(final String key) {
    return asyncGets(key, transcoder);
  }
Gets (with CAS support) the given key asynchronously and decode using the
default transcoder.

@param key the key to fetch
@return a future that will hold the return value of the fetch
@throws IllegalStateException in the rare circumstance where queue is too
          full to accept any more requests
src/main/java/net/spy/memcached/MemcachedClient.java