In `custom_elements`, it would be nice to have support for multiple instances of the same tag. EG: [`dc:creator` allows for multiple instances of it in the XML (as does various items)](http://www.rssboard.org/rss-profile#namespace-elements-dublin-creator): ``` <dc:creator>Person 1</dc:creator> <dc:creator>Person 2</dc:creator> ``` But upon using an array to do so: ``` custom_elements: [ {"dc:creator": authors.map(author => author.name) }, ] ``` It only lists a single `dc:creator` XML element