if your folder is a primary directly under $MAILPATH/ it works fine, as a pure numeric
so folder +2021 is fine -and I do this for archives by year. if your folder is sub-folder under another folder like +sent/2021 it only kind-of works. Any function which performs scan functions looks to pure numeric objects as files, and barfs on the directory. So I work around it by having archives like sent/y2021 and it works fine. the other path out here is to do folder +2021/sent and subfolder sent inside the archive year which works fine. I just wondered if a stat() on the object to skip (sub)folders in contexts which demand files would work? Might be a pain to implement without unwanted side-effects. -G
