With Ikiwiki, mdwn, and discount configured, the following syntax

    [some link with parens in it](http://foo.com/parens(yeah))

Has a broken URI (missing the closing parenthesis) and renders the second parenthesis outside of the link.

Here's it live on ikiwiki.info: [some link with parens in it](http://foo.com/parens(yeah))

Bug present in at least discount 2.2.6 and 2.2.7 and merely exposed by IkiWiki. Note that upstream
consider this to be not-a-bug/"behavior follows specs": https://github.com/Orc/discount/issues/241

The following alternative markdown implementations get this right:

 * libtext-markdown-perl 1.000031 (debian -3) 
 * multimarkdown 1.000035 (debian -2)
 * [commonmark](https://spec.commonmark.org/dingus/?text=%5Bsome%20stupid%20thing%5D(https%3A%2F%2Ffoo.com%2Fmoo(baah)))

I note the irony of the commonmark URI being an apt demo of the problem.

*— [[Jon]], 2021-11-05*