Util.java: This is the code change.
books.json: Required tags file. I didn't see any books from this mod to add, and the code already checks for vanilla books.
content.txt: Mentioned support for 'forge:books'. I thought this would be handy to note here, but I can remove it if you don't think it's appropriate. (The change to the last line was the editor adding a trailing newline character.)
Util.java: This is the code change.books.json: Required tags file. I didn't see any books from this mod to add, and the code already checks for vanilla books.content.txt: Mentioned support for 'forge:books'. I thought this would be handy to note here, but I can remove it if you don't think it's appropriate. (The change to the last line was the editor adding a trailing newline character.)My testing looked the same as shown in https://github.com/mrh0/buildersaddition/issues/36. I tested Builder's Addition alone, and with Tinker's Construct.