docs: @Nonnull
  	public <N, UK> byte[] buildCompositeKeyNamesSpaceUserKey(
  		@Nonnull N namespace,
  		@Nonnull TypeSerializer<N> namespaceSerializer,
  		@Nonnull UK userKey,
  		@Nonnull TypeSerializer<UK> userKeySerializer) throws IOException {
  		serializeNamespace(namespace, namespaceSerializer);
  		userKeySerializer.serialize(userKey, keyOutView);
  		byte[] result = keyOutView.getCopyOfBuffer();
  		resetToKey();
  		return result;
  	}