Wait, is “branch bundles” even a thing? Aren’t these just sections or subsections?
To me @bep’s notion of bundle is like a tar-ball of resources that appear as a single page, with index.md being the main resouce, and the rest being auxiliary resources that are private to the bundle (not accessible by other pages).
By that defition, sections are not bundles and referring to them as such is just going to sow confusion.
See also: Branch Bundles and Leaf Bundles
@bep?