When validating the atom feed produced by the jekyll-feed plugin, I discovered that I had two items in the feed with the same id. It turns out this is because jekyll-feed uses
post.id for the unique id, and I have two posts with identical slugs but different dates.
That is, one post is
_posts/2021-04-01-something.md and another is
_posts/2021-04-05-something.md, but both have a
What do I need to set to include the date in