-% And \lit{*}, which repeats a preamble spec. This is really easy, and not
-% at all like the original one.
+% And \lit{*}, which repeats a preamble spec. The tricky part is ensuring
+% that nested \lit{*} specs work correctly: we must save the loop counter, in
+% |\count 0|, obviously, but \emph{also} the |\iterate| macro built which
+% |\loop| modifies internally. Usually you'd use grouping to fix this, but
+% if we introduce a group level then we won't update the preamble registers
+% correctly. Instead, queue up tokens to restore the values in \TeX's input
+% list.