/**
* Creates a new DomainMessage with all things equal, except metadata.
*
* @param Metadata $metadata Metadata to add
*
* @return DomainMessage
*/
public function andMetadata(Metadata $metadata)
{
$newMetadata = $this->metadata->merge($metadata);
return new DomainMessage($this->id, $this->playhead, $newMetadata, $this->payload, $this->recordedOn);
}
