Map the same leaf to all paths that have the same reference

[ddeltree]

It would be nice if book.proposed.title === book.proposed.author.books[i].title in the case book === book.author.books[i], for all the paths that apply.

Both the proposed and original entries assign the leaf given its path, without concern about other paths that refer to the same value under the same reference. Thus, the others end up being undefined.