Just copying my Mastodon post for posterity!
new problem for you: I get a crash on one of my feeds:
wrote /home/j/.config/rad-reader/subscriptions.opml discovered feedURL http://antirez.com/rss 2023/07/10 09:48:54 absify's parse subpath (parse "\nhttp://antirez.com/news/138\n": net/url: invalid control character in URL)
seems antirez has some weird feed generation going on, might need to trim/strip those URLs when you parse em