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	-- So here's the problem with books. There are two kinds: books from inventory and books from the library.
	-- p.cursor_stack.is_blueprint_book = true for inventory, false for library
	-- p.cursor_record is valid for library, invalid for inventory
	-- both _stack and _record .type == "blueprint-book"
	--
	-- _record has a field called https://lua-api.factorio.com/latest/classes/LuaRecord.html#contents
	--     from this field we can iterate all the blueprints in the book
	-- _stack has a field called https://lua-api.factorio.com/latest/classes/LuaItemCommon.html#active_index
	--     from this field we can determine which blueprint is the active one in a book
	--
	-- But that's the problem. _record doesn't have active_index, and _stack doesn't have .contents.
	-- So we can't really work with either of them.
	-- For _record (library books) we can't actually get the contents of any of the blueprints because
	-- we can't iterate them.
	-- And for _stack we can determine the active blueprint index, but not get the contents of that
	-- blueprint by index.