I think it depends who the user is in your case. In mine it's the developer who has to work with Twirp outside of the standard libraries (maybe different langua

I think it depends who the user is in your case. In mine it's the developer who has to work with Twirp outside of the standard libraries (maybe different language, maybe just wants to incorporate it in their own code, ...). I also like when things are consistent without surprising behavior.