Non-git AUR with submodules

Hi, I took over the package blink1. It is not a -git package so it should have a stable checksum, in my opinion. But since the project it builds uses a submodule, the package uses source=("git+https:/…) and SKIP for the checksum. This way prepare() can do a submodule init and submodule update. Is there a better way to deal with submodules? Or would it be better to download the released binary for the correct architecture and install that? As I currently understand it this would only be acceptable for a -bin package, wouldn't it? (I found no clear guidance when to use that prefix, e.g. zoom) This is my first AUR and I'd like to do it properly. Best, Christian