But, comments in allowed locations are an exception to that rule, and
that exception should be communicated somehow to `IkiWiki::Receive`.
--[[Joey]]
+
+> Complications include:
+>
+> * Hard to see a way to prevent users from committing a comment that
+> claims to be written by someone else.
+> * `checkcontent` hooks need to be run, but can't accept a comment
+> for later moderation, since it's coming in as part of a commit.
+> Best they could do is reject the commit.