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+In pdftex there is are some more heuristics going on when determining the
+tounicode mapping:
+
+- more lookups using periods
+- a prefix tfm:cmr10/foo -> bar mapping
+
+Because in luatex one can have a callback that just loads the tfm and then
+decorates it with tounicodes we don't do this in luatex.
+
+HH