see https://lists.sr.ht/~sircmpwn/sr.ht-discuss/%3CZBpDedlkTPhK7a6s%40gmail.com%3E#%3CCRCSYACUGOBW.2IDBETTRDIG7B@taiga%3E
originally tested at https://todo.sr.ht/~qeef/damn-project/11