What’s fixed

• A folder-backed collection sorts on published_at and position again. Both are the page’s own — one parsed into an instant, the other read from order: in the frontmatter — and the sort was looking for them among the frontmatter fields, where neither is. A collection ordered by either got whatever order the files happened to be read in. Sorting on a date now compares instants, so pages written in different offsets fall in the right order rather than in alphabetical order of their text.