https://github.com/11ty/eleventy/issues/316#issuecomment-441053919 https://github.com/11ty/eleventy/issues/502#issuecomment-498234424 https://github.com/nhoizey/pack11ty/blob/master/src/_11ty/collections/archives.js
11ty/eleventy#316 (comment)
11ty/eleventy#502 (comment)
https://github.com/nhoizey/pack11ty/blob/master/src/_11ty/collections/archives.js