code: public byte[] getBytes(String key, byte[] defaultValue) {
  		String encoded = getStringInternal(key);
  		if (encoded == null) {
  			return defaultValue;
  		} else {
  			return Base64.decodeBase64(encoded.getBytes());
  		}
  	}
docs: Returns the value associated with the given key as a byte array.
  
  @param key
  The key pointing to the associated value.
  @param defaultValue
  The default value which is returned in case there is no value associated with the given key.
  @return the (default) value associated with the given key.