I just cloned the rdiscount git repo, and in 54da94bd495fb08fdedaeb9f64d604ea91c5cc66, there is
exp = %(<ul>\n <li><a href="#Level.1">Level 1</a></li>\n <li><ul>\n
<li><a href="#Level.2">Level 2</a></li>\n </ul></li>\n</ul>)
So there is the one with the period, not with a plus sign. If I read
your test output correctly, discount gives the period, but
ruby-rdiscount expects the plus. So this seems fixed in upstream git
commit dc9b1ce9d764650486e812a3781122c7d96002de "update TOC tests for
slight changes in discount 2.x".
So I guess we will have to wait for a new upstream release or use the
git/master version instead.
Should I ask the upstream author to release it?
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