protected function serializeEmbedMany(EmbedMetadata $embedMeta, EmbedCollection $collection)
    {
        $serialized = [];
        foreach ($collection as $embed) {
            if (!$embed instanceof Embed) {
                continue;
            }
            $serialized[] = $this->serializeEmbedOne($embedMeta, $embed);
        }
        return $serialized;
    }