web commit by http://ethan.betacantrips.com/: saw this and didn't understand

diff --git a/doc/bugs/weird_signature_in_match__95__included__40____41__.mdwn b/doc/bugs/weird_signature_in_match__95__included__40____41__.mdwn
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+Is this a bug? IkiWiki/Plugins/conditional.pm:
+
+`sub match_included ($$;$) { #{{{`
+
+The other match_XXX functions seem to take ($$;@). --Ethan
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