Huh. This got me curious.

Yes, I did just type a bare URL. Every mature markdown parser I've used turns this into a link, and appropriately handles trailing punctuation.

So I went to the spec, and it's explicitly called out that this is not an autolink. Autolinks must be explicitly surrounded with angle brackets <>.

So yeah \shrug.

https://spec.commonmark.org/0.31.2/#autolinks

Edit to be clear: This means that both of our markdown parsers are wrong relative to the commonmark spec. But I'll argue that if a parser is going to attempt to autolink this, then handling trailing punctuation is better than not.