\cfg{input-charset}{ASCII}
+Testing ligatures in normal (fi), empasised (\e{fi}), code (\c{fi}) and
+weak code (\cw{fi}). The latter two should not be ligated.
+
+\c Also in a code paragraph (fi) with bold (fi) and italic (fi).
+\e bb ii
+\c There should be no ligation there.
+
\S{subhead} First subheading
So here's a \I{subheading}\I{subsection}subsection. Just